This question is about the behaviour of visible light and its interactions with different media.
a.[1]
State how the speed of light changes when it travels from water into air.
b.[3]
The diagram shows a ray of light travelling through water towards a flat interface with air.
Complete the ray diagram to show the path of the ray after it enters the air. Include a normal line in your diagram.
c.[1]
The diagram shows three parallel incident light rays hitting a rough, crumpled sheet of aluminium foil. Light is scattered from this surface.
Complete the diagram to show the scattered rays of light.
d.[2]
A stage performer is wearing a jacket that appears green under white light.
Explain why the jacket appears black when illuminated only by a red spotlight.