A ray of light from a denser medium strikes a rarer medium of an angle of incidence i. the reflected and refracted rays make an angle of 90 0 with each other. The angle of reflection and refraction are r and r'. The critical angle is-
Text Solution
Verified by ExpertsThe correct answer is:
A
sin C = 
µ sin i = sin r ′ [r ′ = 90 – r]
µ sin r = sin (90 – r)
µ sin r = cos r
sin r = cos r
sin C = tan r
C = sin –1 (tan r)
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