1. If a ray of light is refracted from medium A into medium B, one can be sure that the speed of light in medium A is _________?

a. is greater than in medium B.

b. is smaller than in medium B

c. is equal to that in medium B

d. maybe smaller or larger than in medium B.

2. The following are parts of a camera except what?

a. iris diaphragm

b. convex lens

c. shutter

d. cornea

3. What kind of image is created by a concave lens?

a. upright and smaller

b. inverted and larger

c. inverted and smaller

d. upright and smaller