Question

One face of prism of refracting angle 30°and R. I √2 is silvered at what angle must a ray of light falls on a unsilvered face so that after refraction into a prism and reflection at the silvered surface it retraces it's path

Answer 1

One face of a prism of refracting angle 30° and refractive index 1.414 is silvered at what angle must a ray of light face on ... because the refracted ray retracts its path.