What is the name of a line drawn at 90° to the surface of a material?
Normal
Boundary
Incident
Which term is used to refer to an incoming ray?
Refracted
What is the law of reflection?
Angle of incidence = angle of reflection
Angle of incidence is less than the angle of reflection
Angle of incidence is greater than or equal to the angle of reflection
Which is densest - air, water or glass?
Air
Water
Glass
What happens to a water wave when it travels from shallow to deep water?
It bends towards the normal
It slows down
It bends away from the normal
What happens to a water wave when it travels from deep to shallow water?
It speeds up
What happens to the wavelength of a water wave when it travels from deep to shallow water?
It increases
It remains unchanged
It decreases
What happens to the frequency of a water wave when it travels from shallow to deep water?
A water wave meets a plane barrier at 60° to the normal. What is the angle of reflection?
30°
60°
120°
A wave passes from shallow water into deep water at an angle of 30° to the normal. Which of these angles is likely to be the angle of refraction?
22°
38°