NEET2015PhysicsRay OpticsActual
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
Options
- A180 o - 3 A
- B180 o - 2 A
- C90 0 - A
- D180 0 + 2 A
Correct answer
B. 180 o - 2 A
Step-by-step solution
μ = sin δ m + A 2 sin A 2 ∵ μ = cot A 2 ∴ cot A 2 = sin δ m + A 2 sin A 2 cos A 2 = sin δ m + A 2 π 2 - A 2 = δ m + A 2 δ m = π - 2 A