A ray of light travelling in a denser medium strikes the boundary of a rarer medium. The ray gets partially reflected and refracted. The angle of reflection is r and that of refraction is r'. If the reflected and refracted rays make an angle of 90 ° with each other then the critical angle for the pair of media is
Text Solution
Verified by ExpertsThe correct answer is:
A
sin -1 (tan r)
….(1)
At critical angle 
…. (2)
from equation (1) & (2)
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