The figure shows what happens when a ray of light enters blocks of two different materials, A and B
(a) In which material does the light travel more slowly, A and B? Explain how you can tell from the diagrams.
(b) Which material, A or B, has the greater refractive index?
Light travels more quickly through water than through glass. If a ray passes from glass into water, which way will it bend: towards or away from the normal?
Perspex is a form of transparent plastic. It has a refractive index . A ray of light strikes the flat surface of a Perspex block with an angle of incidence of . What will be the angle of refraction?
The critical angle for water is . If a ray of light strikes the upper surface of a pond at an angle of incidence of , will it be totally internally reflected? Explain your answer.
