1. Tardigrade
  2. Question
  3. Physics
  4. The angle of a prism is A . One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index μ , of the prism is :-

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. The angle of a prism is $A$ . One of its refracting surfaces is silvered. Light rays falling at an angle of incidence $2A$ on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index $\mu $ , of the prism is :-

NTA AbhyasNTA Abhyas 2020

Solution:

Solution
$\mu =\frac{sin 2 A}{sin A}=\frac{2 sin A cos A}{sin A},\mu =2cosA.$