If a ray of light in a denser medium strikes a rarer medium at an angle of incidence i, the angles of reflection and refraction are respectively, r and r'. If the reflected and refraction rays are at right angles to each other, the critical angle for the given pair of media is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
We know that, 
……… (i)
But 
or 
……… . (ii)
From Eqs. (i) and (ii), we get
The critical angle for pair of media is,
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