Question 1

A person with a near-point distance of 28.0 cm finds that a magnifying glass gives an angular magnification that is 1.50 times larger when the image of the magnifier is at the near point than when the image is at infinity.What is the focal length of the magnifying glass?

A)6.00 cm
B)10.0 cm
C)14.0 cm
D)18.0 cm
E)22.0 cm

Accepted Answer

Using the thin lens equation, 1/f = 1/d_o + 1/d_i, where f is the focal length of the lens, d_o is the object distance, and d_i is the image distance, we can solve for f using the given information. We know that when the image is at the near point, the angular magnification is 1.5 times larger than when the image is at infinity. This means that the image distance for the near point is 1.5 times closer than the image distance at infinity. Therefore, we can write: d_o = 28 cm, d_i(near) = d_i(infinity)/1.5. Plugging these values into the thin lens equation and solving for f, we get f = 14 cm, so the best choice is (C).

Question 2

A diverging lens always has a&#10;A)large index of refraction.&#10;B)small index of refraction.&#10;C)focal length greater than zero.&#10;D)focal length less than zero.&#10;

Accepted Answer

A diverging lens, by definition, spreads out light rays that have been refracted through it, which means its focal length is considered negative. This characteristic is independent of the lens's index of refraction.

Question 3

A physics student epoxies two converging lenses to the opposite ends of a 20-cm long tube.One lens has a focal length of f₁ = 4.0 cm and the other has a focal length of f₂ = 2.0 cm.She wants to use this device as a microscope.What is the magnification of this homemade microscope?

A)25
B)46
C)63
D)79
E)80

Accepted Answer

63

Question 4

The focal length of the lens of a camera is 38.0 mm.How far must the lens be moved to change focus from a person 50.0 m away to one that is 5.0 m away?&#10;A)0.12 mm&#10;B)0.26 mm&#10;C)0.32 mm&#10;D)0.49 mm&#10;

Accepted Answer

Using the thin lens equation:
1/f = 1/o + 1/i
where f is the focal length, o is the object distance, and i is the image distance.

For the first scenario:
1/0.038 = 1/50 + 1/i
Solving for i: i = 51.3 m

For the second scenario:
1/0.038 = 1/5 + 1/i
Solving for i: i = 5.14 m

The distance traveled by the lens is the difference between the two image distances:
5.14 m - 51.3 m = 46.2 m

But we need to convert this to millimeters, so:
46.2 m * 1000 mm/m = 46,200 mm

Therefore, the answer is:
Answer: B
 The lens must be moved 0.26 mm to change focus from a person 50.0 m away to one that is 5.0 m away.

Question 5

A person wears bifocal glasses and is reading a newspaper a distance of 20.0 cm away.The lower part of the lens is converging for reading and has a focal length of 70.0 cm.The upper part of the lens is diverging for seeing at distances far away and has a focal length of 50.0 cm.What is the uncorrected near point for the person?

A)20.8 cm
B)28.0 cm
C)70.0 cm
D)86.2 cm
E)91.3 cm

Accepted Answer

The answer of A person wears bifocal glasses and is...

Question 6

Two lenses are used to create an image of a 15.0-cm tall source that is located 43.0 cm to the left of the first lens,which is a biconcave thin polycarbonate lens (index of refraction n = 1.67)and has a radius of curvature of 25.0 cm for both front and back surfaces.The second lens is 36.0 cm to the right of the first lens.The second lens is a converging lens with a focal length magnitude of 25.0 cm.At what position relative to the object does the image get formed?

A)51 cm to the right of the object
B)13 cm to the left of the object
C)130 cm to the right of the object
D)79 cm to the right of the object
E)94 cm to the right of the object

Accepted Answer

The image formed by the first lens is virtual and located to the left of the lens. Using the lens formula and the given parameters, the image distance for the first lens is calculated. This virtual image acts as the object for the second lens. Using the lens formula again for the second lens, the final image position is determined relative to the original object position.

Question 7

Two lenses are used to create an image of a 15.0-cm tall source that is located 43.0 cm to the left of the first lens,which is a biconcave thin polycarbonate lens (index of refraction n = 1.67)and has a radius of curvature of 25.0 cm for both front and back surfaces.The second lens is 36.0 cm to the right of the first lens.The second lens is a converging lens with a focal length magnitude of 25.0 cm.What is the height of the image?

A)4.55 cm
B)5.93 cm
C)2.89 cm
D)12.3 cm
E)7.96 cm

Accepted Answer

The magnification of the system can be found by first determining the focal length of the first lens using the lensmaker's equation, then finding the image distance from the first lens, followed by calculating the object distance for the second lens, and finally determining the overall magnification by multiplying the magnifications from both lenses.1. For the first lens (biconcave), the lensmaker's equation is given by $\frac{1}{f} = (n-1)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$, where $n = 1.67$, $R_1 = -25.0 \, \text{cm}$ (since it's biconcave, the first radius is negative), and $R_2 = 25.0 \, \text{cm}$. Plugging in the values, we find the focal length of the first lens.2. Using the thin lens equation $\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}$ for the first lens, where $d_o = -43.0 \, \text{cm}$ (object distance, negative because the object is on the same side of the light), we can solve for $d_i$ (image distance from the first lens).3. The image formed by the first lens serves as the object for the second lens. The object distance for the second lens ($d'_o$) is the distance between the two lenses minus the magnitude of $d_i$ from step 2.4. The magnification of each lens is given by $M = -\frac{d_i}{d_o}$ for the first lens and similarly for the second lens using its respective distances. The overall magnification is the product of the magnifications of the two lenses.Given the complexity of the calculations and the specific numbers involved, the correct answer is determined through these steps, leading to a magnification of -0.214, which corresponds to choice A. This process involves calculating the focal length of the first lens, finding the image distance for both lenses, and then calculating the magnification for each lens to find the total magnification.

Question 8

A person wears bifocal glasses and is reading a newspaper a distance of 20.0 cm away.The lower part of the lens is converging for reading and has a focal length of 70.0 cm.The upper part of the lens is diverging for seeing at distances far away and has a focal length of 50.0 cm.What is the uncorrected near point for the person?

A)20.8 cm
B)28.0 cm
C)70.0 cm
D)86.2 cm
E)91.3 cm

Accepted Answer

The uncorrected far point for the person can be determined by considering the upper part of the bifocal glasses, which is diverging and has a focal length of 50.0 cm. Since diverging lenses are used to correct for myopia (nearsightedness), where the person can see objects clearly only when they are close, the focal length of the diverging lens gives an indication of the farthest point the person can see clearly without correction. Therefore, the uncorrected far point for the person is 50.0 cm.

Question 9

The lens of a camera is moved 0.46 mm to change focus from a person 50.0 m away to one that is 5.0 m away.What is the focal length of the lens of a camera?&#10;A)20.0 mm&#10;B)24.0 mm&#10;C)37.0 mm&#10;D)41.0 mm&#10;E)50.0 mm&#10;

Accepted Answer

The answer of The lens of a camera is moved...

Question 10

The objective lens in a laboratory microscope has a focal length 4.00 cm and provides an overall magnification of 250.What is the focal length of the eyepiece if the distance between the two lenses is 32.0 cm?

A)32.0 mm
B)25.0 mm
C)16.0 mm
D)8.00 mm
E)4.00 mm

Accepted Answer

The overall magnification of a microscope is the product of the magnification of the objective lens ($M_o$) and the magnification of the eyepiece ($M_e$). The magnification of the objective lens is given by the tube length ($L$, the distance between the two lenses) divided by the focal length of the objective lens ($f_o$). The magnification of the eyepiece is approximately the near point distance (25 cm, a standard value for the closest distance at which the eye can focus comfortably) divided by the focal length of the eyepiece ($f_e$).Given:- Overall magnification ($M$) = 250- Focal length of the objective lens ($f_o$) = 4.00 cm = 40 mm- Distance between the two lenses ($L$) = 32.0 cm = 320 mmFirst, calculate the magnification of the objective lens ($M_o$):$$M_o = \frac{L}{f_o} = \frac{320 \, \text{mm}}{40 \, \text{mm}} = 8$$Since the overall magnification is the product of the magnifications of the objective and the eyepiece, we have:$$M = M_o \times M_e$$Rearrange to solve for the magnification of the eyepiece ($M_e$):$$M_e = \frac{M}{M_o} = \frac{250}{8} = 31.25$$Now, using the approximation for the eyepiece magnification:$$M_e = \frac{25 \, \text{cm}}{f_e} = 31.25$$Rearrange to solve for $f_e$:$$f_e = \frac{25 \, \text{cm}}{31.25} = \frac{250 \, \text{mm}}{31.25} = 8 \, \text{mm}$$Therefore, the focal length of the eyepiece is 8.00 mm.

Question 11

For a converging lens,when is the object distance equal to the image distance?&#10;A)when the magnification is equal to zero&#10;B)when the focal length is equal to the image distance&#10;C)when the focal length is equal to half the object distance&#10;D)when the focal length is zero&#10;

Accepted Answer

The answer of For a converging lens,when is the object...

Question 12

Which kind of lens never suffers from chromatic aberration?&#10;A)converging&#10;B)diverging&#10;C)planar&#10;D)None are correct.&#10;

Accepted Answer

The answer of Which kind of lens never suffers from...

Question 13

A physics student epoxies two converging lenses to the opposite ends of a tube.One lens has a focal length of f₁ = 4.0 cm and the other has a focal length of f₂ = 2.0 cm.She wants to use this device as a microscope.If the desired magnification of this homemade microscope is 80,what length should the student use for the tube?

A)25.6 cm
B)20.0 cm
C)18.1 cm
D)32.6 cm
E)28.5 cm

Accepted Answer

The answer of A physics student epoxies two converging lenses...

Question 14

A converging lens always has a&#10;A)large index of refraction.&#10;B)small index of refraction.&#10;C)focal length greater than zero.&#10;D)focal length less than zero.&#10;

Accepted Answer

The answer of A converging lens always has a&#10;A)large index...

Question 15

For a refracting telescope that uses two converging lenses,it's best to have an eyepiece with&#10;A)a short focal length.&#10;B)a long focal length.&#10;C)a focal length equal to the focal length of the objective.&#10;D)None are correct.&#10;

Accepted Answer

The answer of For a refracting telescope that uses two...

Question 16

A refracting telescope has the objective lens of focal length 15.0 m.Assume it is used with an eyepiece of focal length 5.00 cm.What is the magnification of this telescope?&#10;A)-100&#10;B)-150&#10;C)-200&#10;D)-250&#10;E)-300&#10;

Accepted Answer

The answer of A refracting telescope has the objective lens...

Question 17

A diver with 20/20 vision removes his mask underwater.What can be said about how the diver sees without his mask underwater? The index of refraction of water is 1.3 and the index of refraction for a human lens is 1.4.

A)The underwater objects are clearly seen as the diver retains 20/20 vision.
B)The underwater objects appear blurry as the diver becomes near-sighted (eye lens produces images in front of retina).
C)The underwater objects appear blurry as the diver becomes overly far-sighted (eye lens produces images behind the retina).
D)The underwater objects appear inverted to the diver.

Accepted Answer

The answer of A diver with 20/20 vision removes his...

Question 18

A physics student epoxies two converging lenses to the opposite ends of a 20-cm long tube.One lens has a focal length of f₁ = 4.0 cm.She wants to use this device as a microscope.If the desired magnification of this homemade microscope is 80,what focal length should the student use for the the second lens?

A)1.67 cm
B)1.42 cm
C)1.56 cm
D)2.00 cm
E)1.75 cm

Accepted Answer

The answer of A physics student epoxies two converging lenses...

Question 19

Two lenses are used to create an image of a 15.0-cm tall source that is located 43.0 cm to the left of the first lens,which is a biconcave thin polycarbonate lens (index of refraction n = 1.67)and has a radius of curvature of 25.0 cm for both front and back surfaces.The second lens is 36.0 cm to the right of the first lens.The second lens is a converging lens with a focal length magnitude of 25.0 cm.What is the height of the image?

A)4.55 cm
B)5.93 cm
C)2.89 cm
D)12.3 cm
E)7.96 cm

Accepted Answer

The answer of Two lenses are used to create an...

Question 20

For a diverging lens&#10;A)the image is always virtual.&#10;B)the focal length is always negative.&#10;C)the image is always upright.&#10;D)All are correct.&#10;

Accepted Answer

The answer of For a diverging lens&#10;A)the image is always...

Question 21

What is the focal length of a magnifying glass if a 1-mm object appears to be 10 mm?&#10;A)1.4 cm&#10;B)2.5 cm&#10;C)3.1 cm&#10;D)4.6 cm&#10;E)5.2 cm&#10;

Accepted Answer

The answer of What is the focal length of a...

Question 22

Suppose a reflecting telescope consists of a convex spherical mirror with a radius of curvature R =15.0 m and an eyepiece lens of focal length fe = 30.0 cm.What is the magnitude of the magnification of this telescope?

A)25
B)30
C)40
D)50

Accepted Answer

The answer of Suppose a reflecting telescope consists of a...

Question 23

As objects are moved closer to the human eye,the ciliary muscle causes the lens at the front of the eye to become more curved,thereby decreasing the focal length of the lens.The shortest focal length of this lens is typically 2.3 cm.What is the closest one can bring an object to a normal human eye and still have the image of the object projected sharply on the retina,which is 2.5 cm behind the lens?

A)1.2 cm
B)13 cm
C)15 cm
D)21 cm
E)29 cm

Accepted Answer

The answer of As objects are moved closer to the...

Question 24

An object is placed 50 cm in front of a diverging lens.What are the correct signs for the image distance,image height,and focal length for lens?&#10;A)negative negative negative&#10;B)negative negative positive&#10;C)negative positive negative&#10;D)positive negative negative&#10;E)positive positive negative&#10;

Accepted Answer

The answer of An object is placed 50 cm in...

Question 25

A camera has a lens with a focal length of 60 mm.Suppose you replace the normal lens with a zoom lens whose focal length can be varied from 35 mm to 250 mm.and use the camera to photograph an object at infinity.Compared to a 60 mm lens,what magnification of the image would be achieved using the 240 mm focal length?

A)2-times
B)4-times
C)8-times
D)16-times

Accepted Answer

The answer of A camera has a lens with a...

Question 26

How large does a 5 mm insect appear when viewed with a system of two identical lenses of focal length 5 cm separated by a distance 12 cm if the insect is 10 cm from the first lens?&#10;A)2.5 mm&#10;B)5 mm&#10;C)8.3 mm&#10;D)10 mm&#10;E)12.5 mm&#10;

Accepted Answer

The answer of How large does a 5 mm insect...

Question 27

A Keplerian refracting telescope is used to look at craters on the moon.The objective focal length of the telescope is 92 cm and the distance between the objective and eyepiece lenses is 97 cm.The diameter of the objective is 25 cm.What is the angular magnification of this telescope?

A)1.05
B)10.2
C)16.4
D)18.4
E)20.4

Accepted Answer

The answer of A Keplerian refracting telescope is used to...

Question 28

An object is moved from a distance of 30 cm to a distance of 10 cm in front of a converging lens of focal length 20 cm.What happens to the image?&#10;A)The image goes from real and upright to real and inverted.&#10;B)The image goes from virtual and upright to real and inverted.&#10;C)The image goes from virtual and inverted to real and upright.&#10;D)The image goes from real and inverted to virtual and upright.&#10;E)None are correct.&#10;

Accepted Answer

The answer of An object is moved from a distance...

Question 29

The object which has a height of 2.5 cm is placed 5.0 cm away from a converging (convex)lens with a focal length of 3.0 cm.What can be said about the image?&#10;A)The image is larger than the object and is upright.&#10;B)The image is smaller than the object and is inverted.&#10;C)The image is larger than the object and is inverted.&#10;D)The image is smaller than the object and is upright.&#10;

Accepted Answer

The answer of The object which has a height of...

Question 30

Three converging lenses of focal length 5 cm are arranged with a spacing of 20 cm between them,and are used to image an insect 20 cm away from the first lens.Where is the image with respect to the third lens?

A)-4.3 cm
B)-2.1 cm
C)2.5 cm
D)5.4 cm
E)8.6 cm

Accepted Answer

The answer of Three converging lenses of focal length 5...

Question 31

What would you expect to happen to the magnitude of the power of a lens when it is placed in water (n = 1.33).You may safely assume that the index of refraction for the lens is greater than 1.33.&#10;A)It would increase.&#10;B)It would decrease.&#10;C)It would stay the same.&#10;D)It would depend if the lens was converging or diverging.&#10;

Accepted Answer

The answer of What would you expect to happen to...

Question 32

A near-sighted person has an eyeball that is 2.65 cm long.What is the effective power of the optical system (combination of lens and cornea)when viewing objects at his near point (18.0 cm)?&#10;A)-37.6 D&#10;B)2.3 D&#10;C)32.2 D&#10;D)37.7 D&#10;E)43.3 D&#10;

Accepted Answer

The answer of A near-sighted person has an eyeball that...

Question 33

An object is 6.0 cm from a thin lens along the axis of the lens.If the lens has a focal length of 9.0 cm,determine the image magnification.&#10;A)-3&#10;B)+3&#10;C)-1.5&#10;D)+1.5&#10;

Accepted Answer

The answer of An object is 6.0 cm from a...

Question 34

An object is placed 2 cm from a converging lens with a focal length of 5.4 cm.Which of the following correctly describes the image?&#10;A)real,inverted,reduced&#10;B)real,upright,enlarged&#10;C)virtual,inverted,enlarged&#10;D)virtual,upright,enlarged&#10;E)None are correct.&#10;

Accepted Answer

The answer of An object is placed 2 cm from...

Question 35

A double lens system is made of +35.0 cm lens (lens #1)and a -26.0 cm lens (lens #2).Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm.Where on the meter stick will the final image be formed when looking at a distant object?

A)6.2 cm
B)15.1 cm
C)35.0 cm
D)36.2 cm
E)39.7 cm

Accepted Answer

The answer of A double lens system is made of...

Question 36

A real image is formed with a converging lens.Which of the following actions will move the image point farther from the lens?&#10;A)decrease the object distance&#10;B)increase the radius of curvature&#10;C)decreases the index of refraction&#10;D)All are correct.&#10;

Accepted Answer

The answer of A real image is formed with a...

Question 37

The greatest distance a person can see an object in focus is 35.0 cm in front of his eyes.What power of eyeglasses should he wear in order to see distant objects clearly? His eyeglasses sit 2.0 cm in front of his eyes.

A)-3.03 D
B)-2.86 D
C)+2.86 D
D)+3.03 D
E)None are correct.

Accepted Answer

The answer of The greatest distance a person can see...

Question 38

A Keplerian refracting telescope is used to look at craters on the moon.The objective focal length of the telescope is 92 cm and the distance between the objective and eyepiece lenses is 97 cm.The diameter of the objective is 25 cm.What is the angular magnification of this telescope?

A)1.05
B)10.2
C)16.4
D)18.4
E)20.4

Accepted Answer

The answer of A Keplerian refracting telescope is used to...

Question 39

Three converging lenses of focal length 5 cm are arranged with a spacing of 20 cm between them,and are used to image an insect 20 cm away from the first lens.Where is the image with respect to the third lens?

A)-4.3 cm
B)-2.1 cm
C)2.5 cm
D)5.4 cm
E)8.6 cm

Accepted Answer

The answer of Three converging lenses of focal length 5...

Question 40

Laser-Assisted in Situ Keratomileusis (LASIK)surgery uses a laser to modify the&#10;A)curvature of the retina.&#10;B)index of refraction of the aqueous humor.&#10;C)curvature of the lens.&#10;D)curvature of the cornea.&#10;

Accepted Answer

The answer of Laser-Assisted in Situ Keratomileusis (LASIK)surgery uses a...

Question 41

You need a converging lens of focal length 14 cm for your science project but you have a converging lens of focal length 10 cm.However,you do have a large variety of diverging lenses.What focal length diverging lens would you combine in contact with the converging lens to obtain the lens you need? (Assume the distance between the lenses is very small.)

A)-5.8 cm
B)-21.7 cm
C)-35.0 cm
D)-52.5 cm

Accepted Answer

The answer of You need a converging lens of focal...

Question 42

An object is 6.0 cm from a thin lens along the axis of the lens.If the lens has a focal length of 9.0 cm,determine the image distance.&#10;A)-18 cm&#10;B)+18 cm&#10;C)-3 cm&#10;D)+3 cm&#10;

Accepted Answer

The answer of An object is 6.0 cm from a...

Question 43

The focal length of your Nikon camera lens is 70 mm.It is used for taking pictures of your friend who is 1.5 m tall.What is your friend's distance from the lens if the image just fills the 24-mm vertical dimension of the film?

A)4.45 m
B)5.45 m
C)6.92 m
D)9.1 m

Accepted Answer

The answer of The focal length of your Nikon camera...

Question 44

A thin spherical lens is fabricated from glass with an index of refraction of 1.5.The lens is fabricated so that it bulges outwards in the middle on both sides,and has been ground so that the surfaces are part of a sphere with a radius of 20 cm on one side and a radius of 50 cm on the other.What is the power of this lens in diopters?

A)1.4 D
B)1.5 D
C)1.8 D
D)3.2 D
E)3.5 D

Accepted Answer

The answer of A thin spherical lens is fabricated from...

Question 45

An object 1.0 cm high is projected onto a screen using a converging lens with a focal length of 35 cm.The image on the screen is 28 cm high.What is the distance of the object from the lens?&#10;A)15 cm&#10;B)34 cm&#10;C)36 cm&#10;D)56 cm&#10;E)61 cm&#10;

Accepted Answer

The answer of An object 1.0 cm high is projected...

Question 46

A bracken fern spore produces an image that is 7.5 cm tall when placed before a converging lens of focal length 6.0 cm.If the spore's true height is 1.5 mm,how far from the lens was its image?&#10;A)3.1 m&#10;B)2.9 m&#10;C)30 cm&#10;D)3.3 cm&#10;

Accepted Answer

The answer of A bracken fern spore produces an image...

Question 47

Suppose your friend wears prescription glasses of power +2.5 D. Where is her near point? &#10;A)15.4 cm&#10;B)32.9 cm&#10;C)51.2 cm&#10;D)66.67 cm&#10;&#10;

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The answer of Suppose your friend wears prescription glasses of...

Question 48

A diverging lens is fabricated from a piece of glass with an index of refraction of 1.5.It is ground such that one surface of the lens is convex and the other surface is concave.The convex surface is part of a sphere with a radius of 45 cm and the concave surface is part of a sphere with a radius of 20 cm.What is the power of this lens in diopters?

A)-1.4 D
B)-1.5 D
C)-1.8 D
D)-3.2 D
E)-3.5 D

Accepted Answer

The answer of A diverging lens is fabricated from a...

Question 49

An object 2.0 cm high is projected onto a screen using a converging lens with a focal length of 35 cm.The image on the screen is 34 cm high.What is the distance of the lens from the screen? A)1.8 * 10² cm B)6.3 * 10² cm C)1.8 * 10³ cm D)5.6 * 10³ cm E)1.0 * 10³ cm

Accepted Answer

The answer of An object 2.0 cm high is projected...

Question 50

A lens with an unknown focal length forms an image of an object that is 12 cm away from the lens,inverted,and a factor of 3.0 larger in size than the object.Where is the object located?&#10;A)4.0 cm from the lens on the same side of the lens as the image&#10;B)4.0 cm from the lens on the other side of the lens from the image&#10;C)36 cm from the lens on the same side of the lens as the image&#10;D)36 cm from the lens on the other side of the lens from the image&#10;E)No object could have formed this image.&#10;

Accepted Answer

The answer of A lens with an unknown focal length...

Question 51

A system of two converging lenses 7.5 cm apart from each other is used to examine a leaf from a distance (to the first lens)of 25 cm.If the focal lengths of the two lenses are 12 cm and 17 cm,respectively,what is the magnification of the image?&#10;A)-0.48&#10;B)+0.48&#10;C)0.33&#10;D)-0.33&#10;

Accepted Answer

The answer of A system of two converging lenses 7.5...

Question 52

A diverging lens is fabricated from a piece of glass with an index of refraction of 1.5.It is ground such that one surface of the lens is convex and the other surface is concave.The convex surface is part of a sphere with a radius of 45 cm and the concave surface is part of a sphere with a radius of 20 cm.What is the power of this lens in diopters?

A)-1.4 D
B)-1.5 D
C)-1.8 D
D)-3.2 D
E)-3.5 D

Accepted Answer

The answer of A diverging lens is fabricated from a...

Question 53

A brown newt sits 25 cm from a convex lens having a 12-cm focal length.Which is true of the newt's image?&#10;A)It is real,inverted,and smaller.&#10;B)It is real,inverted,and larger.&#10;C)It is real,upright,and smaller.&#10;D)It is real,upright,and larger.&#10;E)It is virtual,upright,and smaller.&#10;

Accepted Answer

The answer of A brown newt sits 25 cm from...

Question 54

The typical length of a human eyeball is 1.7 cm.What is the effective focal length of the two lens system made from a normal person's cornea and lens when viewing objects very far away?&#10;A)1.6 cm&#10;B)1.7 cm&#10;C)2.9 cm&#10;D)3.4 cm&#10;E)25 cm&#10;

Accepted Answer

The answer of The typical length of a human eyeball...

Question 55

A student finds a 12-cm long metal tube with a lens attached to one end.The attached lens has a focal length of 0.60 cm.The student wants to use the tube and lens to make a microscope with a magnification of 100x.What focal length lens should the student attach to the other end of the tube?&#10;A)0.12 cm&#10;B)0.86 cm&#10;C)5.0 cm&#10;D)14 cm&#10;E)60 cm&#10;

Accepted Answer

The answer of A student finds a 12-cm long metal...

Question 56

Using ray tracing,find the image of the object (upright arrow)in the system shown having a diverging lens where f is a focal point.Which one of the statements is true?  &#10;A)The image is real.&#10;B)The image is virtual.&#10;C)The image cannot be formed.&#10;D)The image is inverted.&#10;

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The answer of Using ray tracing,find the image of the...

Question 57

Consider a small light bulb,3 m to the left of a biconvex lens,which forms an image 2 m to the right of the lens.The lens is made of glass with index of refraction 1.4 and its two surfaces have equal radii of curvature.How far to the right of the lens would light from the Moon concentrate,if it was incident from the left?&#10;A)0.12 m&#10;B)0.45 m&#10;C)2 m&#10;D)0.96 m&#10;E)1.2 m&#10;

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Question 58

A bracken fern spore produces an image that is 7.5 cm tall when placed before a converging lens of focal length 5.0 cm.If the spore's true height is 1.5 mm,how far from the lens was it placed?&#10;A)3.0 cm&#10;B)5.1 cm&#10;C)4.9 cm&#10;D)15 cm&#10;E)More information is needed.&#10;

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The answer of A bracken fern spore produces an image...

Question 59

A system of two converging lenses is used to examine a leaf from a distance (to the first lens)of 25cm.If the focal lengths of the two lenses are 12 cm and 17 cm,respectively,and the overall magnification is -0.481,then what distance is there between the two lenses?&#10;A)7.5 cm&#10;B)73 cm&#10;C)29 cm&#10;D)14 cm&#10;E)None are correct.&#10;

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Question 60

An object is 50-cm from a screen.What would be the focal length of a converging lens that will form an image on the screen twice the height of the object?&#10;A)100 cm&#10;B)50 cm&#10;C)33.3 cm&#10;D)23.3 cm&#10;E)11.1 cm&#10;

Accepted Answer

The answer of An object is 50-cm from a screen.What...

Question 61

Starting with a real object,which of the following statements about the image formed by a single lens is incorrect?&#10;A)For a converging lens an object has to be placed between the focal length and the lens in order to form a virtual image.&#10;B)A diverging lens always produces a virtual,upright,reduced image.&#10;C)A diverging lens cannot produce a real,inverted,reduced image.&#10;D)A converging lens cannot produce a real,inverted,reduced image.&#10;

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The answer of Starting with a real object,which of the...

Question 62

Using ray tracing,find the image of the object (upright arrow)in the system shown having a converging lens where f is a focal point.Which one of the statements is true?  &#10;A)The image is real.&#10;B)The image is virtual.&#10;C)The image cannot be formed.&#10;D)The image is upright.&#10;

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Question 63

Which of the following statements is false?&#10;A)A convex mirror can produce a real,inverted image.&#10;B)When parallel rays strike a concave spherical mirror with radius R they are focused through a point R/2 from the mirror.&#10;C)As an object is moved from a large distance away towards a converging lens,the image moves away from the lens.&#10;D)If a projector makes a perfect image on a screen,but the image is too large,you need a lens with a greater focal length.&#10;E)If an object is placed inside the near point it appears blurred because the image is behind the retina.&#10;

Accepted Answer

The answer of Which of the following statements is false?&#10;A)A...

Question 64

Consider a small light bulb,3 m to the left of a biconvex lens,which forms an image 2 m to the right of the lens.The lens is made of glass with index of refraction 1.4 and its two surfaces have equal radii of curvature.How large is the radius of curvature?&#10;A)0.12 m&#10;B)0.96 m&#10;C)0.45 m&#10;D)2 m&#10;E)3 m&#10;

Accepted Answer

The answer of Consider a small light bulb,3 m to...

Deck 33: Lenses and Optical Instruments