A ray of light from a denser medium strikes a rarer medium at angle of incidence `i`.
Channel: Doubtnut
Date: 2020-08-30

A ray of light from a denser medium strikes a rarer medium at angle of incidence `i`. The refrected and the refracted rays make an angle of `90^@` with each other. The angles of reflection and refraction are r and `r^'` respectively. The critical angle is   (i) `sin^-1(tanr)`   (ii) `sin^-1(tani)`   (iii) `sin^-1(tanr)`   (iv) `tan^-1(tani)`