Exam #1

Question 1

10cm

Answer 1

-10D

Question 2

20cm

Answer 2

-5D

Question 3

25cm

Answer 3

-4D

Question 4

33cm

Answer 4

-3D

Question 5

40cm

Answer 5

-2.5D

Question 6

50cm

Answer 6

-2D

Question 7

67cm

Answer 7

-1.50D

Question 8

80cm

Answer 8

-1.25D

Question 9

100cm

Answer 9

-1D

Question 10

If RO is at infinity…

Answer 10

it = 0

Question 11

For clinical purposes, we normally consider
distances greater than _____ as infinitely far away

Answer 11

For clinical purposes, we normally consider
distances greater than 20 ft (or 6 m) as infinitely far away

Question 12

Index of air

Answer 12

n=1

Question 13

Index of water

Answer 13

n=1.333

Question 14

Refraction: Low density to high density

Answer 14

Light bends towards the normal

Question 15

Refraction: High density to low density

Answer 15

Light increases speed; does NOT bend toward the normal

Question 16

Snells Law formula:

Answer 16

n (sin i) = n’ (sin r)

Question 17

What is the critical angle?

Answer 17

when the angle of incidence exceeds 24.40 degrees, which is
referred to as the critical angle, the light ray does not emerge from the material—
it undergoes a phenomenon referred to as total internal reflection.

Question 18

What ray connects the center of curvature and the surface’s focal points?

Answer 18

This ray travels along the surface’s OPTICAL AXIS