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.
a. 8 degrees
b. 13 degrees
c. 19 degrees
d. 60 degrees

2. 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?
a. 200,000 km/s
b. 300,000 km/s
c. 400,000 km/s
d. 500,000 km/s