PhysicsJEE Main 2 Apr 2026, Shift 2·Q16·MCQ·Easy–moderate

Ray Optics · Refraction

One side of an equilateral prism is painted by a transparent material of refractive index

n_2

. The refractive index of prism is 1.6. The maximum value of

n_2

required for total internal reflection from painted face is .

(1) $\dfrac{3\sqrt3}{1.6}$
(2) $\sqrt3$
(3) $\dfrac{3.2}{\sqrt3}$
(4) $\dfrac{4\sqrt3}{5}$

We corrected a printing error in the original paper

Source printed “minimum value of $n_2$ ”; corrected to the intended “maximum value of $n_2$ ” (TIR at the painted face needs $n_2 \le 1.6\sin60^\circ$ ).

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Ray Optics · Refraction

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