Answer to Question #51678 in Optics for samson

Question

1 .The critical angle for total internal reflection at an air-water interface is approximately 48o
. In which of the following situations will total internal reflection occur?

a. light incident in water at 40o
b. light incident in water at 55o
c.light incident in air at 40o
d. light incident in air at 48o

2 What effect does enlarging of the hole in a pinhole camera have on the image? The image gets

a. larger

b smaller

c. shaper

d. fuzzier

3. A camera obscura used by a potrait painter is located 6 m from a child who stands 1 m tall. How tall is her image if the back of the camera obscura is 2 m away?

a. 1/3 m

b. 1/2 m

c 1 m

d 3 m

4 The law of reflection states that
a. light travels in a straight line
b. light must be reflected into our eyes to be seen
c. the angle of reflection is equal to the angle of incidence
d. light striking a rough surface is scattered in all directions