A glass prism of refractive index 1.5 is immersed in water (μ=43). A light beam incident normally on the face AB is totally reflected to reach the face BC if
A
sinθ>89
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B
23<sinθ<89
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C
sinθ≤23
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D
cosθ≥89
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Solution
The correct option is Asinθ>89 From figure it is clear that Total internal reflection takes place at AC, only if θ>C ⇒sinθ>sinC⇒sinθ>1ωμg⇒sinθ>198⇒sinθ>89