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Exam 8: The Microscope

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Question 21

Multiple Choice

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

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

E) C) and D)
F) A) and B)

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Question 22

True/False

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

A) True
B) False

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Question 23

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Imagine you are placing a slide on a compound microscope for examination. Describe each part of the microscope you would handle and adjust to complete this process.

Which microscope provides a right-side-up image?

Which of the following statements is FALSE?

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

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

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)Size of the specimen area being observed B)Provides a simultaneous view of two specimens C)Space between the specimen and objective lens D)Illumination required to view a transparent object E)Illumination of a specimen from above F)The thickness of a specimen in focus G)Eyepiece multiplied by objective lens H)The image seen through a compound microscope I)The lower lens of a microscope positioned directly over the specimen J)Presents a distinctive three-dimensional image K)Used to examine birefringent materials L)Image formed by the actual convergence of light rays on a screen -Transmitted illumination

Briefly describe how a comparison microscope works and what it is used for.

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

What is the most important tool of the firearms examiner?

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

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

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

Indicate what type of microscope (compound, comparison, stereoscopic, or polarizing light)should be used to analyze each of the following items of evidence: a. fired bullets b. a synthetic fiber c. soil minerals d. paint chips e. a shed head hair

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:

The stereoscopic microscope has a narrow field of view.

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

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

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