Wave interactions

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Question 12
Medium

This question is about the behavior of visible light.

a.

State how the speed of light changes when it travels from air into glass.

[1]
b.

The diagram shows a ray of light travelling through air towards a flat glass block.

A diagram showing a horizontal boundary dividing Air (above) and Glass (below). A single ray of light in the air is directed downwards and to the right, meeting the boundary at an angle of incidence of approximately 50^\circ.

Complete the ray diagram to show the path of the ray after it enters the glass. Include a normal line in your diagram.

[3]
c.

The diagram shows three parallel incident rays hitting the rough surface of a sheet of paper. Light is scattered from this surface.

Three parallel incident rays with downward-pointing arrows strike a highly irregular, wavy horizontal surface. Each ray hits a different, curved section of the wavy surface.

Complete the diagram to show the scattered rays.

[1]
d.

A student is wearing a T-shirt that appears blue under white light.

Explain why the T-shirt appears black when illuminated only by red light.

[2]

Wave interactions Questions

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