chapter 8

Question 1

virtual image

Answer 1

an image that cannot be seen directly. it can be seen only by a viewer looking through a lens

Question 2

real image

Answer 2

an image formed by the actual convergence of light rays on a screen

Question 3

objective lens

Answer 3

the lower lens of a microscope which is positioned directly over the specimen

Question 4

eyepiece lens

Answer 4

the lens of a microscope into which the viewer looks same as the ocular lens

Question 5

transmitted illumination

Answer 5

light that passes up from the condenser and through the specimen

Question 6

vertical or reflected illumination

Answer 6

illumination of a specimen from above; used to examine opaque specimens

Question 7

condenser

Answer 7

the lens system under the microscope stage that focuses light onto the specimen

Question 8

parfocal

Answer 8

describes a microscope such that when an image is focused with one objective in position, the other objective can be rotated into place and the field will remain in focus

Question 9

monocular

Answer 9

describes a microscope with one eyepiece

Question 10

binocular

Answer 10

microscope with 2 eyepieces

Question 11

field of view

Answer 11

the area of the specimen that can be seen after it is magnified

Question 12

depth of focus

Answer 12

the thickness of a specimen that is entirely in focus under a microscope

Question 13

plane-polarized light

Answer 13

light confined to a single plane of vibration

Question 14

polarizer

Answer 14

a device that permits the passage of light waves vibrating in only one plane

Question 15

microspectrophotometer

Answer 15

an instrument that links a microscope to a spectrophotometer