PhysicsJEE Main 23 Jan 2026, Shift 2·Q15·MCQ·Moderate

Ray Optics · Refraction

A prism of angle

75^\circ

and refractive index

\sqrt3

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 .
(

\sin15^\circ = 0.25

and

\sin25^\circ = 0.43

)

(1)between $15^\circ$ and $20^\circ$
(2) $15^\circ$
(3) $> 25^\circ$
(4) $< 15^\circ$

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Ray Optics · Refraction

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