Using the formula above, 1. What is the angle of refraction in a medium if the angle of incidence in air is 48˚ and the index of refraction of the medium is 1.58?

2. A ray of light in air strikes a block of quartz at an angle of incidence of 30˚. The angle of refraction is 20˚. What is the index of refraction in quartz?

3. A ray of light passes from air into water at an angle of incidence of 50˚. What is the angle of refraction?