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Question 1

Cite the law of reflection.

Answer 1

The angle of incidence equals the angle of reflection.

Question 2

Is a mirage the result of reflection or refraction? Why does it happen?

Answer 2

Refraction. Light curves through warm, low-density air near the ground, where it travels faster.

Question 3

How does refraction change the apparent depth of a swimming pool?

Answer 3

It makes the pool look shallower - only ¾ as deep.

Question 4

What is the angle between a light ray and its wavefront?

Answer 4

A right angle

Question 5

Why does refraction occur?

Answer 5

The speed of light changes from one transparent medium to another.

Think of the wheels of a cart slowing as they get caught in the grass with the cart coming from the sidewalk. Trajectory changes

Question 6

Does wavelength of light change when the medium changes? How about frequency?

Answer 6

Wavelength, yes. Frequency, no.

Question 7

We say light is ______ when it is returned into the medium from which it came.

Answer 7

reflected Always at the same angle.

Question 8

Refractive index

Answer 8

Indicates how much the speed of light differs from its speed in a vacuum. Indicates the extent of bending rays.

Question 9

Refracted light that bends _____ the normal is light that has slowed down.

Answer 9

towards

Question 10

Is a fish in the water farther or closer than it appears?

Answer 10

Farther. Light bends down, eyes see a trajectory equal to how the light hits the water and therefore it appears higher in the water.