A ray of light from denser medium strikes a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of 90° with each other. The angle of reflection and refraction are r and r'. The critical angle is :

Question:

A ray of light from denser medium strikes a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of 90° with each other. The angle of reflection and refraction are r and r’. The critical angle is :

Options :

(a) sin^-1(cos r)
(b) sin^-1(tan i)
(c) sin^-1(tan r')
(d) tan^-1(sin i)

Answer :

(b) sin^-1(tan i)

Answer Steps :

step 1

step 2

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