Compound Light Microscope

Question 1

optical instrument which is used to observe those that are not being seen by ordinary vision

Answer 1

compound microscope

Question 2

optical constant of the lens, distance from the center of the lens to the point where parallel rays entering the lens are brought to a focus

Answer 2

focal length

Question 3

free space between the specimen surface and the objective

Answer 3

working distance

Question 4

measure of the resolving power of an objective

Answer 4

numerical aperture

Question 5

true or false

0.25 NA allows the viewer to distinguish as separate 25,000 lines per inch, if a specimen is known to be of the order of 26,000 lines per inch, the observer can never see the lines as separate no matter how much magnification is used

Answer 5

true

Question 6

property to recognize features of a specimen that are close to each other as separate and distinct

Answer 6

resolving power of an objective

Question 7

means that the objectives are optically and mechanically designed so that the distance between the specimen and the aerial image is always constant

Answer 7

parfocal

Question 8

true or false

slight refocusing with the aid of the fine focus knob is sufficient to resolve critical sharpness of the image after changing from one objective to another, thus the coarse focus knob need not to be operated

Answer 8

true