NEET2016PhysicsRay OpticsActual
The angle of incidence for a ray of light at a refracting surface of a prism is 45 o . The angle of prism is 60 o . If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are:
Options
- A45 o ; 1 2
- B30 o ; 2
- C45 o ; 2
- D30 o ; 1 2
Correct answer
B. 30 o ; 2
Step-by-step solution
At minimum deviation δ m i n = 2 i - A δ m i n = 2 45 - 60 δ m i n = 30 o Refractive index of material is μ = sin δ m i n + A 2 sin A 2 = sin 30 + 60 2 sin 30 o μ = sin 45 o sin 30 o = 1 2 1 2 = 2