Year: 2015
Topic: Ray optics and optical instruments
Time :
1. The refracting angle of a prism is A, and refractive index of the material of the prism is cot(A/2). The angle of minimum deviation is:
(1). 180° - 3A
(2). 180° - 2A
(3). 90° - A
(4). 180° 2A