A triangular prism of glass is shown in the figure. A ray incident normally to one face is totally reflected, if θ=45∘. The index of refraction of glass is

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Less than 1.41

Equal to 1.41

Greater than 1.41

None of the above

answer is C.

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Detailed Solution

For total internal reflection θ>C⇒sin⁡θ>sin⁡C⇒sin⁡θ>1μ or μ>1sin⁡θ⇒μ>1sin⁡45∘⇒μ>2⇒μ>1.41

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