If the speed of light in the medium of an equilateral prism is 2.12 × 108 m/s, find the minimum angle of deviation (taking c = 3 × 108 m/s).

The magnifying power of an astronomical telescope in normal adjustment is 10 and the focal length of its eyepiece is 20 cm. The focal length of its objective lens will be:

If the speed of light is 2.12 × 108 m/s inside the medium of an equilateral prism, find the angle of minimum deviation (δm). (Take speed of light in vacuum c = 3 × 108 m/s, sin 45° = 0.707)