A ray of light is incident normally on one face of a prism as shown in figure. The refractive index of the material of the prism is 35 and the prism is immersed in water of refractive index 34 then
This question has multiple correct options
A
The angle of emergence Θ2 of the ray is sin−1(85)
B
The angle of emergence Θ2 of the ray is sin−1(435)
C
The angle of emergence Θ2 of the ray is sin−1(347)
D
Total internal reflection will not occur at P if the refractive index of water increases to a value greater than 235 by dissolving some substance
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Solution
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Correct options are A) and D)
Initially at P, there is TIR, There force at Q (snells law)
35sin300=34sinΘ2
⇒sinΘ2=85⇒Θ2=sin−1(85)
If μw>235⇒sinC>2/35/23⇒C>600
Therefore, now TIR will not occur at P
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