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

Angle of prism is A and its one surface is silvered. Light rays fallin

1.	Angle of prism is A and its one surface is silvered. Light rays falling at an angle of incidence 2A on first surface return back through the same path after suffering reflection at second silvered surface. Refracting index of the material of the prism is
Answer» 2 SinA 2 COS A `1//2` cos A tan A Answer :B