A ray of light is travelling from glass to air. (Refractive index of glass =1.5). The angle of incidence is 50o.The deviation of the ray is
A
0o
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B
80o
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C
50o−sin−1[sin50o1.5]
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D
sin−1[sin50o1.5]−50o
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Solution
The correct option is B 80o aμg=1.5
∴1.5=cosecC
Or, C=420.
Critical angle for glass =420. Hence a ray of light incident at 500 in glass medium undergoes total internal reflection. δ denotes the deviation of the ray.