ABC is a glass prism with `/_ A = 90°` and other two angles `45°` each

(a) Prove that any light ray that enters the prism through face AB will emerge out through the face AC if refractive index of the glass of the prism is `mu ge sqrt(2)` .
(b) A ray of light is incident parallel to BC at a height h = 3.0 cm from BC. Find the height above BC at which the emergent ray leaves the surface AC. It is given that `mu = sqrt(2)` and length `BC = 20 cm`. [Take `tan 15° 0.25]`

Answer

(b) 1m