Read pages 562 - 567 [TEXTBOOK].
Read pages 4:41 - 4:72 [REVIEW BOOK].

1. What is refraction? (b) In which direction is light refracted on passing obliquely from air or a vacuum into a denser substance? (c) What happens to the angle of refraction as the angle of incidence decreases from 45^o to 0^o?
2. A ray passes from air into water (n = 1.33) at an angle of incidence of 50^o. Find the angle of refraction to the nearest degree.
3. Two rays of light are incident at an angle of 45^o on a piece of quartz (n = 1.46) and a diamond (n = 2.42) respectively. Compare their angles of refraction.
4. A certain color of light is incident upon a rectangular block of quartz at an angle of 30.0^o. It is refracted by the quartz so that the angle of refraction is 20.0^o. What is the index of refraction of quartz for this particular light?
5. The diagram below shows a ray of light passing from medium X into air. What is the absolute index of refraction of medium X?