Wave behaviour

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Question 16
Medium

This question is about visible light.

a.

State one change that happens to light when it travels from water into air.

[1]
b.

Diagram in Fig. 22.1 shows a ray of light from a starfish at the bottom of an aquarium filled with water.

Fig. 22.1: A cross-section of an aquarium with water at the bottom and air on top, separated by a flat horizontal interface. A starfish is drawn at the bottom. A straight line with an arrow pointing upwards and slightly to the right starts from the starfish and ends at the water-air interface.

Complete the ray diagram in Fig. 22.1 to show the path of the ray after it leaves the water. Include a normal line in your diagram.

[2]
c.

Diagram in Fig. 22.2 shows three parallel incident rays hitting the textured surface of the starfish. Light is scattered from this surface.

Fig. 22.2: A magnified, bumpy, irregular horizontal line labeled 'Surface of the starfish'. Three parallel straight arrows indicating incident light rays point downwards and end at different points on the bumpy surface.

Complete the diagram in Fig. 22.2 to show the scattered rays.

[1]
d.

The starfish appears blue under white light.

Explain why the starfish appears black under red light.

[2]

Wave behaviour Questions

  1. GCSE
  2. /Physics
  3. /Wave behaviour