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:
65x
100x
650x
450x
In order to examine an opaque object with a compound microscope, one must:
Use transmitted illumination.
Light the object from beneath the stage.
Use reflected illumination.
Stain the object before viewing it.
A parfocal microscope:
Eliminates the need to stain the specimen to be viewed.
Has two ocular lenses.
Requires a polarized light source.
Allows for ease of focusing when switching from low to high power.
As the magnification of the compound microscope is increased, the field of view:
Decreases
Remains the same
Increases
Becomes more focused
As the magnifying power of the compound microscope increases, the depth of focus:
Becomes less focused
A comparison microscope designed to examine bullets and fibers is equipped with:
Vertical illumination.
Transmitted illumination.
Oblique illumination.
Both A and B.
When using a compound microscope, the areas above and below the depth of focus are best viewed by adjusting the:
Eyepiece lens.
Fine or coarse adjustment.
Intensity of the illumination.
Numerical aperture.
Which microscope has the largest potential working distance?
Steroscopic
Comparison
Polarizing
Compound
Which microscope provides a right-side-up image?
In the design of a polarizing microscope, the polarizer is placed between the:
Specimen and the analyzer.
Analyzer and the eyepiece.
Light source and the sample stage.
Sample stage and the analyzer.
Normally with a polarizing microscope, the polarizer and analyzer are set:
Parallel to each other.
So that maximum plane polarized light can reach the eyepiece.
Perpendicular to each other.
So that they are in constant motion.
Which microscope is best suited to the study of birefringent minerals and fibers?
Stereoscopic
Microspectrophotometer
The condenser of a compound microscope is located:
At the base.
Within the body tube.
Beneath the stage.
Between the coarse and fine adjustments.
Which microscope plots an absorption spectrum of the item under examination?
A microscope with which light source, when linked to a spectrophotometer, will provide a "fingerprint" spectrum of the object being viewed?
Visible
Plane polarized
IR (infrared)
UV (ultraviolet)
_____ are used to focus the SEM (scanning electron microscope).
Analyzers
Lenses
Polarizers
Magnets
The image produced by an SEM is initially displayed on:
An X-ray analyzer.
Photographic paper.
An X-ray film.
A cathode ray tube.
The microscope that provides the highest resolution and greatest depth of focus is the:
SEM
Which microscope can be linked to an X-ray analyzer?
Which microscope is most likely to be used as a tool for determining whether or not a suspect has recently fired a gun?
When the SEM's primary electron beam bombards a specimen, it causes the emission of:
Electrons from elements of the upper layer of the specimen.
X-rays from the target.
Gamma rays from the target.
Richard Bruno Hauptmann was convicted of the kidnap and murder of the Lindbergh child in part on the basis of optical examination of:
GSR (gunshot residue)
Wood
Hair
Fibers
A microscope uses a combination of _____ to magnify an image.
Stages
Mirrors
Confocals
A type of image that cannot be viewed directly is called a(n) ___________ image.
Real
Imaginary
Reflected
Virtual
A transparent specimen is viewed through a microscope using _____ light while an opaque object requires _____ illumination.
Transmitted; stereoscopic
Confocal; transmitted
Vertical; horizontal
Transmitted; vertical
The size of the specimen area in view is known as the:
Depth of field.
Field of view.
Stage size.
Objective.
Crystals that are _____ produce two planes of polarized light, each perpendicular to the other.
Amporphous
Solid
Birefringent
Colored
If crystals of unknown origin are viewed under a polarizing microscope and appear dark, what can be concluded about the crystals?
The crystals are not heroin crystals
The crystals are colorless
The crystals are polarizing
The crystals are non-polarizing
What instrument can be used to view a single fiber found at a crime scene and identify its generic class?
Infrared microspectrophotometer
Stereoscopic microscope
Polarizing microscope
Both a and c
The major advantages of the SEM image include all of the following except:
High magnification.
High reproducibility.
High resolution.
Great depth of focus.
Components of a compound microscope include all of the following except:
Expander.
Stage.
Coarse adjustment.
Condenser.
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:
0.65
3.00
30.00
0.75
An object with the letter "L" is viewed under low power of a compound microscope. The image would appear as:
Regular
Upside-down, Flipped
Upside-down
Flipped
The magnification power of a microscope equals the magnifying power of the:
Objective lens.
Objective lens multiplied by two.
Objective lens multiplied by the eyepiece lens.
The microscope examination of a bullet requires:
Transmitted light.
Reflected light.
Condensed light.
All of the above.
Which of these is not part of the optical system of a compound microscope?
Abbé condenser
Objective lens
Eyepiece lens
The body tube
Which of the following statements is false?
If the polarizer and analyzer of a polarizing microscope are placed parallel to each other, no light will penetrate.
Light confined to a single plane of vibration is said to be polarized.
Many crystals are birefringent.
The lens nearest the specimen is called the objective lens.
The most important tool of the firearms examiner is the:
Compound microscope.
Comparison microscope.
Stereoscopic microscope.
Polarizing microscope.
Which of the following is false?
The scanning electron microscope (SEM) produces an image by aiming a beam of electrons onto a specimen.
The major attraction of the SEM is its high magnification and depth of field.
The SEM produces an image that is stereoscopic in appearance.
Microwaves are generated when the electron beam of the SEM strikes a target.
Palynology is the study of:
Fish
Insects
Birds
Spores
Which type of pollen is rarely deposited on objects except by direct contact with the plant?
Anemophilous
Exine
Entomophilous
Gameotphyte
The pattern of the pollen grain surface is called:
Sculpturing.
Apertures.
Exine.
Pollen rain.
