Best Digital Camera Under 200

1.Red light (n = 1.520) and violet light (n = 1.538) traveling in air are incident on a slab of crown glass. Both colors enter the glass at the same angle of refraction. The red light has an angle of incidence of 30 degrees. What is the angle of incidence of the violet light?

These values are not given in the problem, but the index of refraction for air is n =1, and the index of refraction for crown glass is n = 1.523.

2.Mars subtends an angle of 8.0 X 10^-5 radians (8 times 10 to the power of minus 5 radians) at the unaided eye. An astronomical telescope has an eyepiece with a focal length of 0.032 meters. When Mars is viewed using this telescope, it subtends an angle of 2.8 X 10^-3 radians (2.8 times 10 to the power of minus 3 radians). Find the focal length of the telescope’s objective lens.