A prism of angle 75^° and refractive index √3 is coated with thin… | JEE Main 2026 Physics PYQ

MCQMediumJEE Main 2026 · 23 January, Shift 2Prisms & Total Internal Reflection

A prism of angle $75^\circ$ and refractive index $\sqrt{3}$ is coated with thin film of refractive index $1.5$ only at the back exit surface. To have total internal reflection at the back exit surface the incident angle must be _____. ( $\sin 15^\circ = 0.25$ and $\sin 25^\circ = 0.43$ )

A
$> 25^\circ$
B
$15^\circ$
C
between $15^\circ$ and $20^\circ$
D
$< 15^\circ$

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