Manipal MET2022PhysicsRay Optics
The angle of a prism is A . One of its refracting surface is silvered. If light rays: falling at an angle of incidence 2 A on the first suface returns back through the same path ater reflection from silvered surface. The refractive index of the prism is
Options
- A2 A
- B2 A
- C1 2 A
- DA
Correct answer
B. 2 A
Step-by-step solution
If reflected ray from silvered surface retrace its path, then it falls normally on the silvered surface. From the geometry, aligned & i=2 A, r=A & = Refractive index = i r (From Snell's law) & = 2 A A = 2 A A A & =2 A aligned