Deck 8: The Microscope

Question 1

The image produced by an SEM is initially displayed on:

A)An X-ray analyzer.
B)Photographic paper.
C)An X-ray film.
D)A cathode ray tube.

Answer 1

D

Question 2

A compound microscope is equipped with two objective lenses (10x and 45x)and has a 10x ocular lens. The highest magnification attainable with this instrument is:

A)65x
B)100x
C)650x
D)450x

Answer 2

D

Question 3

Which microscope has the largest potential working distance?

A)Stereoscopic
B)Comparison
C)Polarizing
D)Compound

Answer 3

A

Question 4

________ are used to focus the SEM (scanning electron microscope).

A)Analyzers
B)Lenses
C)Polarizers
D)Electromagnets

Question 5

A comparison microscope designed to examine bullets and fibers is equipped with:

A)Vertical illumination.
B)Transmitted illumination.
C)Oblique illumination.
D)Both A and B.

Question 6

A parfocal microscope:

A)Eliminates the need to stain the specimen to be viewed.
B)Has two ocular lenses.
C)Requires a polarized light source.
D)Allows for ease of focusing when switching from low to high power.

Question 7

Which microscope provides a right-side-up image?

A)Comparison
B)Stereoscopic
C)Compound
D)Polarizing

Question 8

Which microscope plots an absorption spectrum of the item under examination?

A)Polarizing
B)Comparison
C)Stereoscopic
D)Microspectrophotometer

Question 9

In the design of a polarizing microscope, the polarizer is placed between the:

A)Specimen and the analyzer.
B)Analyzer and the eyepiece.
C)Light source and the sample stage.
D)Sample stage and the analyzer.

Question 10

Which microscope can be linked to an X-ray analyzer?

A)SEM
B)Microspectrophotometer
C)Stereoscopic
D)Polarizing

Question 11

Which microscope provides the highest resolution and greatest depth of focus?

A)SEM
B)Comparison
C)Compound
D)Stereoscopic

Question 12

As the magnification of the compound microscope is increased, the field of view:

A)Decreases.
B)Remains the same.
C)Increases.
D)Becomes more focused.

Question 13

As the magnifying power of the compound microscope increases, the depth of focus:

A)Remains the same.
B)Decreases.
C)Increases.
D)Becomes less focused.

Question 14

Which microscope is best suited to the study of birefringent minerals and fibers?

A)Stereoscopic
B)Microspectrophotometer
C)Polarizing
D)Comparison

Question 15

In order to examine an opaque object with a compound microscope, one must:

A)Use transmitted illumination.
B)Light the object from beneath the stage.
C)Use reflected illumination.
D)Stain the object before viewing it.

Question 16

When using a compound microscope, the areas above and below the depth of focus are best viewed by adjusting the:

A)Eyepiece lens.
B)Fine or coarse adjustment.
C)Intensity of the illumination.
D)Numerical aperture.

Question 17

Which microscope is most likely to be used as a tool for determining whether or not a suspect has recently fired a gun?

A)Comparison
B)Polarizing
C)SEM
D)Stereoscopic

Question 18

Normally with a polarizing microscope, the polarizer and analyzer are set:

A)Parallel to each other.
B)So that maximum plane polarized light can reach the eyepiece.
C)Perpendicular to each other.
D)So that they are in constant motion.

Question 19

The condenser of a compound microscope is located:

A)At the base.
B)Within the body tube.
C)Beneath the stage.
D)Between the coarse and fine adjustments.

Question 20

A microscope with which light source, when linked to a spectrophotometer, will provide a "fingerprint" spectrum of the object being viewed?

A)Visible
B)Plane polarized
C)IR (infrareD)
D)UV (ultraviolet)

Question 21

An object with the letter "L" is viewed under low power of a compound microscope. The image would appear as:

A)

B)

C)

D)

Question 22

Which of the following is FALSE?

A)The scanning electron microscope (SEM)produces an image by aiming a beam of electrons onto a specimen.
B)The major attraction of the SEM is its high magnification and depth of field.
C)The SEM produces an image that is stereoscopic in appearance.
D)Microwaves are generated when the electron beam of the SEM strikes a target.

Question 23

A transparent specimen is viewed through a microscope using ________ light while an opaque object requires ________ illumination.

A)Transmitted; stereoscopic
B)Confocal; transmitted
C)Vertical; horizontal
D)Transmitted; vertical

Question 24

Components of a compound microscope include all of the following EXCEPT:

A)Expander.
B)Stage.
C)Coarse adjustment.
D)Condenser.

Question 25

The size of the specimen area that can be seen is known as the:

A)Depth of field.
B)Field of view.
C)Stage size.
D)Objective.

Question 26

The microscope examination of a bullet requires:

A)Transmitted light.
B)Reflected light.
C)Condensed light.
D)All of the above.

Question 27

Which of the following statements is FALSE?

A)If the polarizer and analyzer of a polarizing microscope are placed parallel to each other, no light will penetrate.
B)Light confined to a single plane of vibration is said to be polarized.
C)Many crystals are birefringent.
D)The lens nearest the specimen is called the objective lens.

Question 28

When the SEM's primary electron beam bombards a specimen, it causes the emission of:

A)Electrons from elements of the upper layer of the specimen.
B)X-rays from the target.
C)Gamma rays from the target.
D)Both A and B

Question 29

An objective lens with a numerical aperture of 1.50 can separate details at half the distance of a lens with a numerical aperture of:

A)0)65.
B)3)00.
C)30.00.
D)0)75.

Question 30

What is the most important tool of the firearms examiner?

A)Compound microscope
B)Comparison microscope
C)Stereoscopic microscope
D)Polarizing microscope

Question 31

What instrument can be used to view a single fiber found at a crime scene and identify its generic class?

A)Infrared microspectrophotometer
B)Stereoscopic microscope
C)Polarizing microscope
D)Both A and C

Question 32

The magnification power of a microscope equals the magnifying power of the:

A)Eyepiece lens.
B)Objective lens.
C)Objective lens multiplied by two.
D)Objective lens multiplied by the eyepiece lens.

Question 33

A type of image that cannot be viewed directly is called a(n)________ image.

A)Real
B)Imaginary
C)Reflected
D)Virtual

Question 34

Which type of pollen is rarely deposited on objects EXCEPT by direct contact with the plant?

A)Anemophilous
B)Exine
C)Entomophilous
D)Gametophyte

Question 35

Crystals that are ________ produce two planes of polarized light, each perpendicular to the other.

A)Amorphous
B)Solid
C)Birefringent
D)Colored

Question 36

If crystals of unknown origin are viewed under a polarizing microscope and appear dark, what can be concluded about the crystals?

A)The crystals are not heroin crystals.
B)The crystals are colorless.
C)The crystals are polarizing.
D)The crystals are non-polarizing.

Question 37

Which of these is NOT part of the optical system of a compound microscope?

A)Abbé condenser
B)Objective lens
C)Eyepiece lens
D)Body tube

Question 38

Palynology is the study of:

A)Fish.
B)Insects.
C)Birds.
D)Spores.

Question 39

A microscope uses a combination of ________ to magnify an image.

A)Stages
B)Mirrors
C)Lenses
D)Confocals

Question 40

The major advantages of the SEM image include all of the following EXCEPT:

A)High magnification.
B)High reproducibility.
C)High resolution.
D)Great depth of focus.

Question 41

Transmitted illumination can be used only with specimens that are transparent.

Question 42

The scanning electron microscope produces an image by aiming a beam of electrons onto a specimen.

Question 43

A compound microscope produces greater magnification because it uses two lenses to enlarge the object being viewed instead of just one.

Question 44

Many crystals are birefringent.

Question 45

The microscopic examination of a bullet requires reflected light.

Question 46

If the polarizer and analyzer of a polarizing microscope are placed parallel to each other, no light will penetrate.

Question 47

The lens nearest the specimen is called the ocular lens.

Question 48

The magnification power of a microscope equals the magnifying power of the objective lens multiplied by two.

Question 49

A forensic scientist would use vertical illumination when studying opaque specimens.

Question 50

An IR spectrum is unique for every chemical substance.

Question 51

The body tube is part of the optical system of a compound microscope.

Question 52

A virtual image can be seen directly with the naked eye.

Question 53

The pattern of the pollen grain surface is called:

A)Sculpturing.
B)Apertures.
C)Exine.
D)Pollen rain.

Question 54

The stereoscopic microscope forms an inverted and reversed image.

Question 55

As magnifying power increases, the microscope's depth of focus decreases.

Question 56

The SEM produces an image that is stereoscopic in appearance.

Question 57

The stereoscopic microscope is the most frequently used microscope in the crime laboratory.

Question 58

Bullets fired through the same barrel display comparable markings, called striations, caused by the rifling of the barrel.

Question 59

The stereoscopic microscope has a narrow field of view.

Question 60

As magnifying power increases, the microscope's field of view also increases.

Question 61

With opaque specimens, the light source must be placed ________ the specimen and reflected off the specimen's surface and into the lens.

Question 62

The ________ allows the forensic scientist to view a particle under a microscope while at the same time obtaining its absorption spectrum.

Question 63

It is not possible to identify a geographical origin by the type and percentages of airborne pollen grains.

Question 64

The infrared microspectrophotometer is used to analyze fibers and paints.

Question 65

Unique shapes, aperture type, and surface ________ are typically used to identify spore samples.

Question 66

The ________ microscope presents a three-dimensional image of an object.

Question 67

Pollen and spores can be used to provide links between a crime scene and a person or object.

Question 68

If the ________ on two bullets viewed through a comparison microscope are alike, the examiner can conclude that both bullets traveled through the same barrel.

Question 69

The pollen expert's first task is to calculate the pollen ________ for the crime scene.

Question 70

The major attraction of the ________ is its high magnification and depth of field.

Question 71

A ________ uses a stream of electrons to create an image of the specimen being studied.

Question 72

The ________ lens magnifies the real, enlarged image created by the objective lens, producing a greatly enlarged virtual image of the object.

Question 73

The most important tool of the firearms examiner is the ________ microscope.

Question 74

The pollen of entomophilous plants is dispersed by wind.

Question 75

A(n)________ image is an image formed when light rays converge on a surface.

Question 76

________ aperture measures the ability of an objective lens to resolve details into separate images instead of one blurred image.

Question 77

Light confined to a single plane of vibration is said to be ________.

Question 78

A ________ microscope is used to make side-by-side comparisons of specimens.

Question 79

Pollen grains are the single-celled male ________ of seed-bearing plants.

Question 80

________ illumination is illumination of a specimen from above.