JEE Main 2019 — Physics solution | Fundamenthol

JEE Main2019Physics

Q.

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 on the face AB at an angle $θ$ (shown in the figure). Total internal reflection takes place at point E on the face BC.

Then $θ$ must satisfy:

A
$θ > sin^{- 1} \frac{μ _{1}}{μ _{2}}$
B
$θ < sin^{- 1} \frac{μ _{1}}{μ _{2}}$
C
$θ < sin^{- 1} \frac{μ _{2}^{2}}{μ _{1}^{2}} - 1$
D
$θ > sin^{- 1} \frac{μ _{2}^{2}}{μ _{1}^{2}} - 1$

Solution

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