1. The index of refraction for air is approximately 1.00, and for quartz it's about 1.50. A light beam in air strikes the surface of the quartz at an angle of 30° with the normal. When it enters the quartz it is refracted. Calculate this approximate angle of refraction.
   

A8 degrees

B13 degrees

C19 degrees

D60 degrees

1. A light beam in air strikes the surface of water at an angle of 26° with the normal. When it enters the water it bends towards the normal and makes an angle of 19° with it. The velocity of light in water is approximately 225,000 km/s. What is the approximate velocity of light in air?
   

A200,000 km/s

B300,000 km/s

C400,000 km/s

D500,000 km/s