Optics and Dispensing

Question 1

Speed light travels?

Answer 1

186,000 mps in air

Question 2

Diopter (D)

Answer 2

Unit of measure for lenses

Question 3

What is 1 diopter?

Answer 3

focuses light at 1 meter

Question 4

Plus lenses are also called?

Answer 4

Convex lens

Question 5

Minus lenses are also called

Answer 5

Concave lens

Question 6

Convex

Answer 6

Plus lenses thicker in the center and thinner on edges

Question 7

Concave

Answer 7

Minus lens thinner in center thicker on edges

Question 8

Plus lens diverge or converge?

Answer 8

Converge

Question 9

Converge

Answer 9

To bring closer together

Question 10

Minus lenses correct?

Answer 10

Myopia (nearsightedness)

Question 11

Spherical lens deviates light in how many directions?

Answer 11

one

Question 12

Cylinder lens deviates light in how many directions?

Answer 12

more than one

Question 13

What does spherical measure?

Answer 13

How much myopia/hyperopia is present

Question 14

Cylinder?

Answer 14

Measures astigmatism

Question 15

1 prism diopter

Answer 15

deviates light 1 centimeter at 1 meter

Question 16

Aspheric lens

Answer 16

wider field of view, thinner lens surface , less eye distortion