This question is about the behaviour of light waves.
State one property of a light wave that remains constant when it travels from quartz into water.
Figure 1 shows a ray of light travelling from a block of quartz towards a flat boundary with water.
Complete the ray diagram in Figure 1 to show the path of the ray after it enters the water. Include a normal line, and label the angle of incidence iii and the angle of refraction rrr.
Figure 2 shows three parallel incident light rays striking the microscopically rough surface of a brushed aluminum sheet. Light is scattered from this surface.
Complete the diagram in Figure 2 to show the scattered rays.
A leaf of a plant appears green under white light.
Explain why the leaf appears black when it is illuminated only by pure red light.