Optics Answers

If a 4-m-tall child stands 2 m in front of a vertical plane mirror, the image of the child will be ------- m tall

1
2
3
4

If you stand 2 m in front of a plane mirror, how far from you is your image?

1 m
2 m
3 m
4 m

The law of reflection states that?

light travels in a straight line
light must be reflected into our eyes to be seen
the angle of reflection is equal to the angle of incidence
light striking a rough surface is scattered in all directions

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?

1/3 m
1/2 m
1 m
3 m

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

larger
smaller
shaper
fuzzier

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?

light incident in water at 40o
light incident in water at 55o
light incident in air at 40o
light incident in air at 48o

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?

light incident in water at 40o
light incident in water at 55o
light incident in air at 40o
light incident in air at 55o

Calculate the critical angle for light passing from rock salt into air given that the refractive index of rock salt is 1.54

37.4 degrees
40.5 degrees
53.2 degrees
67.3 degrees

The refractive index of diamond is given as 2.42. A ray of yellow light of wavelength 589 nm passes through a rectangular diamond block in 1.32×10−9 s. What is the thickness of the block?

10.5 cm
12.7 cm
16.4 cm
22.3 cm

What is the refractive index of glass material for which the speed of light in it is
1.92×108 m/s?

2.41
1.56
0.54
1.35