Exam 8: The Microscope

A comparison microscope designed to examine bullets and fibers is equipped with:

Which type of pollen is rarely deposited on objects EXCEPT by direct contact with the plant?

Many crystals are birefringent.

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

The pollen of entomophilous plants is dispersed by wind.

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

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

What instrument can be used to view a single fiber found at a crime scene and identify its generic class?

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 -Depth of focus

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

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

The magnification power of a microscope equals the magnifying power of the:

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

The stereoscopic microscope forms an inverted and reversed image.

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 -Working distance

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

Which two instruments are combined to make a microspectrophotometer? Describe the utility of using this device to produce an IR spectrum of evidence such as fibers or paints.

________ illumination is illumination of a specimen from above.

Which of the following is FALSE?

The pollen expert's first task is to calculate the pollen ________ for the crime scene.