Ch 19: Optical Instruments Flashcards
1
Q
What is the SI unit for refractive power?
A
diopter, abbreviated D, which is defined as 1 D = 1 m-1
2
Q
A converging lens has a ________ power, and a _________ lens has a negative power.
A
positive
diverging
3
Q
Which kind of lens corrects for nearsightedness?
A
diverging lens
4
Q
Which kind of lens corrects for farsightedness?
A
converging lens
5
Q
The refractive power of a combination of lenses is:
A
Ptotal = P1 + P2 = (1/f1) + (1/f2)
6
Q
What rule governs how two lenses work in combination?
A
the image from the first lens acts as the object for the second lens
p. 670
