Physics · 2019
JEE Main · 12 April 2019, Shift 2 · Q22
A transparent cube of side d, made of a material of refractive index μ_2, is immersed in a liquid of refractive index μ_1(μ_1<μ_2). A ray is incident…
A transparent cube of side d , made of a material of refractive index $\displaystyle \mu_2$, is immersed in a liquid of refractive index $\displaystyle \mu_1\left(\mu_1<\mu_2\right)$. A ray is incident on the face AB at an angle $\displaystyle \theta$ (shown in the figure). Total internal reflection takes place at point E on the face BC.
Then $\displaystyle \theta$ must satisfy :
Then $\displaystyle \theta$ must satisfy :Official answer
(1)
$\displaystyle \theta<\sin ^{-1} \sqrt{\frac{\mu_2^2}{\mu_1^2}-1}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.