Optics and Dispensing Flashcards
1
Q
Speed light travels?
A
186,000 mps in air
2
Q
Diopter (D)
A
Unit of measure for lenses
3
Q
What is 1 diopter?
A
focuses light at 1 meter
4
Q
Plus lenses are also called?
A
Convex lens
5
Q
Minus lenses are also called
A
Concave lens
6
Q
Convex
A
Plus lenses thicker in the center and thinner on edges
7
Q
Concave
A
Minus lens thinner in center thicker on edges
8
Q
Plus lens diverge or converge?
A
Converge
9
Q
Converge
A
To bring closer together
10
Q
Minus lenses correct?
A
Myopia (nearsightedness)
11
Q
Spherical lens deviates light in how many directions?
A
one
12
Q
Cylinder lens deviates light in how many directions?
A
more than one
13
Q
What does spherical measure?
A
How much myopia/hyperopia is present
14
Q
Cylinder?
A
Measures astigmatism
15
Q
1 prism diopter
A
deviates light 1 centimeter at 1 meter
