Deck 8: The Microscope

Question 1

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

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

Answer 1

A

Question 2

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

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

Answer 2

D

Question 3

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

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

Answer 3

D

Question 4

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 5

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 6

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 7

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 8

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.

Question 9

Which microscope has the largest potential working distance?

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

Question 10

The microscope that provides the highest resolution and greatest depth of focus is the:

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

Question 11

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 12

Which microscope provides a right-side-up image?

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

Question 13

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 14

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

Question 15

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

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

Question 16

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 17

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 18

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 19

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 20

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 21

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

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

Question 22

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 23

The most important tool of the firearms examiner is the:

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

Question 24

The size of the specimen area in view is known as the:

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

Question 25

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 26

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 27

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

A) Abbé condenser
B) Objective lens
C) Eyepiece lens
D) The body tube

Question 28

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 29

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 30

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 31

The microscope examination of a bullet requires:

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

Question 32

Richard Bruno Hauptmann was convicted of the kidnap and murder of the Lindbergh child in part on the basis of optical examination of:

A) GSR (gunshot residue).
B) Wood.
C) Hair.
D) Fibers.

Question 33

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 34

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 35

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

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

Question 36

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

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

Question 37

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

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

Question 38

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 39

Palynology is the study of:

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

Question 40

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 41

The microscopic examination of a bullet requires reflected light.

Question 42

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 43

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

Question 44

Many crystals are birefringent.

Question 45

The SEM produces an image that is stereoscopic in appearance.

Question 46

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

Question 47

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

Question 48

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

Question 49

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

Question 50

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

Question 51

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

Question 52

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

Question 53

An IR spectrum is unique for every chemical substance.

Question 54

The stereoscopic microscope has a narrow field of view.

Question 55

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

Question 56

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

Question 57

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

Question 58

The lens nearest the specimen is called the ocular lens.

Question 59

The stereoscopic microscope forms an inverted and reversed image.

Question 60

The pattern of the pollen grain surface is called:

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

Question 61

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

Question 62

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

Question 63

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

Question 64

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

Question 65

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

Question 66

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

Question 67

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

Question 68

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

Question 69

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

Question 70

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

Question 71

The pollen of entomophilous plants is dispersed by wind.

Question 72

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

Question 73

The magnification power of a microscope equals the magnifying power of the objective lens ________ by the eyepiece lens.

Question 74

The infrared microspectrophotometer is used to analyze fibers and paints.

Question 75

________ illumination is illumination of a specimen from above.

Question 76

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

Question 77

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

Question 78

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 79

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

Question 80

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