Question

A ray of light from a denser medium strikes a rarer medium at an angle incidence as shown in figure. The reflected and refracted rays make an angle of 90 with each other. The angles of reflection and refraction and r and r1. The critical angle is
A. sin-1 (tan r)
B. sin-1 (tan i)
C. sin-1 (tan r1)
D. tan-1(tan i)

Answer 1

Answer:

c=sin-1(tanr1) is the answer