A transparent block A having refractive index μ₂ = 1.25 is surrou… | JEE Main 2025 Physics PYQ

MCQMediumJEE Main 2025 · 7 April, Shift 2Prisms & Total Internal Reflection

A transparent block A having refractive index $\mu_2 = 1.25$ is surrounded by another medium of refractive index $\mu_1 = 1.0$ as shown in figure. A light ray is incident on the flat face of the block with incident angle $\theta$ as shown in figure. What is the maximum value of $\theta$ for which light suffers total internal reflection at the top surface of the block ?

$Ray entering rectangular block A from surrounding medium with mu1 equals 1.0, block refractive index mu2 equals 1.25, incident angle theta at left face, refracted ray reaches top face where critical angle theta_C is marked, then emerges along the top surface.$

A
$\tan^{-1}(4/3)$
B
$\tan^{-1}(3/4)$
C
$\sin^{-1}(3/4)$
D
$\cos^{-1}(3/4)$

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