When a beam of light goes from denser medium ( μ d ) to rarer medium ( μ r ), then it is generally observed that magnitude of angle of incidence is half that of angle of refraction. Then magnitude of incident angle will be- (here μ = μ d / μ r )
A
2 sin -1 
B
2 cos -1 μ
C
cos -1 
D
2 cos -1 
Text Solution
Verified by ExpertsThe correct answer is:
C
µ d sin i = µ r sin 2i
µ d = 2 μ r cos i
i = cos –1 
= cos –1 
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