Q7 Explain how light can be reflected at lots of different angles from a rough surface and still obey the law of reflection. Use a diagram in your answer. Q8 Read the following statements.
A: You can have refraction without dispersion
B: You cannot have dispersion without refraction

a Discuss a situation where statement A is true.

b Discuss a situation where statement B is true.

Q9 A light year is the distance that light travels in a year. It takes light about 8.3 minutes (or 500 seconds) to travel the 150 million km from the Sun. a Calculate how far light travels in 1 second.

b The Moon is 1.3 light seconds from Earth. Calculate how far away it is in km. ​