Deck 7: Crime-Scene Reconstruction

Question 1

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

A) increases.
B) remains the same.
C) decreases.

Answer 1

C

Question 2

Which microscope has the largest potential working distance?

A) polarizing
B) compound
C) stereoscopic
D) fluorescent
E) comparison

Answer 2

C

Question 3

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

A) 100x.
B) 650x.
C) 4500x.
D) 65x.
E) 450x.

Answer 3

E

Question 4

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

A) microspectrophotometer
B) stereoscopic
C) compound
D) polarizing
E) comparison

Question 5

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

A) polarizing.
B) compound.
C) comparison.
D) SEM.
E) stereoscopic.

Question 6

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

A) eyepiece lens.
B) intensity of the illumination.
C) fine or coarse adjustment.
D) objective lens.
E) numerical aperture.

Question 7

A parfocal microscope:

A) requires a polarized light source.
B) requires the use of a fluorescent light source.
C) allows for ease of focusing when switching from low to high power.
D) has two ocular lenses.
E) eliminates the need to stain the specimen to be viewed.

Question 8

Which microscope provides a right-side-up image?

A) microspectrophotometer
B) polarizing
C) comparison
D) compound
E) stereoscopic

Question 9

The polarizer and analyzer in a polarizing microscope are normally set:

A) parallel to each other.
B) so that they are in constant motion.
C) so that maximum plane polarized light can reach the eyepiece.
D) perpendicular to each other.
E) none of the above

Question 10

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
E) none of the above

Question 11

The condenser of a compound microscope is located:

A) beneath the stage.
B) between the coarse and fine adjustments.
C) within the body tube.
D) at the base.
E) in the eyepiece.

Question 12

The image produced by an SEM is initially displayed on:

A) an X-ray film.
B) a sheet of photographic paper.
C) a cathode ray tube.
D) an x-ray analyzer.
E) photographic paper.

Question 13

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

A) microspectrophotometer
B) polarizing
C) comparison
D) stereoscopic
E) compound

Question 14

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

A) Polarizers
B) Magnets
C) Lenses
D) Diffraction gratings
E) Analyzers

Question 15

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

A) sample stage and the analyzer.
B) analyzer and the eyepiece.
C) light source and the sample stage.
D) specimen and the sample stage.
E) specimen and the analyzer.

Question 16

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) UV (ultraviolet)
D) IR (infrared)
E) x-ray

Question 17

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

A)
B)
C)
D)
E) none of the above.

Question 18

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

A) remains the same.
B) increases.
C) decreases.

Question 19

The resolving power of a lens with a numerical aperture (N.A.) of 1.3 is ________ a lens with an N.A. of 0.65.

A) less than
B) the same as
C) greater than

Question 20

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

A) use reflected illumination.
B) light the object from beneath the stage.
C) use transmitted illumination.
D) use infrared analysis.
E) stain the object before viewing it.

Question 21

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

A) stages
B) lenses
C) confocals
D) mirrors
E) prisms

Question 22

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) all of the above
E) A and C only

Question 23

Define:

-Depth of Focus

Question 24

Bruno Richard 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) hair.
C) wood.
D) soil.
E) fibers.

Question 25

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

A) expander
B) illuminator
C) coarse adjustment
D) condenser
E) stage

Question 26

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
E) both A and C

Question 27

Define:

- Magnification

Question 28

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

A) confocal; transmitted
B) transmitted; vertical
C) vertical; horizontal
D) transmitted; stereoscopic
E) vertical; reflected

Question 29

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

A) the crystals are non-polarizing
B) the crystals are colorless
C) the crystals are not heroin crystals
D) the crystals vary in size
E) the crystals are polarizing

Question 30

Compare and contrast the comparison microscope to the compound microscope.

Question 31

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) 3.00
B) 0.075
C) 0.75
D) 0.65
E) 30.00

Question 32

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

A) objective
B) depth of field
C) stage size
D) field of view
E) none of the above

Question 33

Define:

- Working Distance

Question 34

Define:

- Field of View

Question 35

Which microscope is most likely to be used as a tool for determining whether a suspect has recently fired a gun?

A) stereoscopic
B) polarizing
C) compound
D) SEM
E) comparison

Question 36

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

A) illusory
B) real
C) imaginary
D) virtual
E) reflected

Question 37

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

A) SEM
B) stereoscopic
C) microspectrophotometer
D) compound
E) polarizing

Question 38

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

A) colored
B) birefringent
C) solid
D) amorphous
E) isotropic

Question 39

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

A) high resolution
B) high reproducibility
C) great depth of focus
D) high magnification
E) none of the above

Question 40

Briefly describe how a microspectrophotometer is used to examine trace evidence.