Forensics Chapter 7 Review – Flashcards
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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:
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450x
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In order to examine an opaque object with a compound microscope, one must:
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use reflected illumination.
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allows for ease of focusing when switching from low to high power.
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A parfocal microscope:
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As the magnifying power of the compound microscope increases, the depth of focus:
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decreases
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A comparison microscope designed to examine bullets and cartridges is equipped with:
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vertical illumination, transmitted illumination
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An object with the letter "L" is viewed under low power of a compound microscope. The image would appear as:
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upside down "L"; like the number "7"
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The condenser of a compound microscope is located:
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beneath the stage.
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When using a compound microscope, the areas above and below the depth of focus are best viewed by adjusting the:
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fine or coarse adjustment.
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Which microscope has the largest potential working distance?
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stereoscopic
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Which microscope provides a right-side-up image?
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stereoscopic
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In the design of a polarizing microscope, the polarizer is placed between the:
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light source and the sample stage.
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Which microscope is best suited to the study of birefringent minerals and fibers?
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polarizing
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Which microscope plots an absorption spectrum of the item under examination?
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microspectrophotometer
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A microscope with which light source, when linked to a spectrophotometer, will provide a "fingerprint" spectrum of the object being viewed?
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IR (infrared)
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The microscope that provides the highest resolution and greatest depth of focus is the:
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SEM
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Which microscope can be linked to an X-ray analyzer?
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SEM
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Which microscope is most likely to be used as a tool for determining whether a suspect has recently fired a gun?
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SEM
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When the SEM's primary electron beam bombards a specimen, it causes the emission of:
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electrons from elements of the upper layer of the specimen, X-rays from the target.
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Polarizing Microscope
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Used to examine birefringent materials
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Working Distance
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space between specimen and the objective lens
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Comparison Microscope
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Provides a simultaneous view of two specimens
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Stereoscopic Microscope
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Presents a distinctive three-dimensional imag
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Field of View
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Size of the specimen area being observed
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Transmitted Illumination
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Illumination required to view a transparent object
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Depth of Focus
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The thickness of a specimen in focus
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Magnification
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Eyepiece multiplied by objective lens
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Virtual Image
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The image seen through a compound microscope
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Objective Lens
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The lower lens of a microscope positioned directly over the specimen
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Real Image
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The image formed by the actual convergence of light rays on a screen
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Vertical Illumination
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Illumination of a specimen from above
