Angle of prism is `A` and its one surface is silvered. Light rays falling at an angle of incide
Channel: Doubtnut
Date: 2020-01-19

Angle of prism is `A` and its one surface is silvered. Light rays falling at an angle of incidence `2 A` on first surface return back through the same path after suffering reflection at second silvered surface. Refraction index of the material of prism is