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JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 2 April 2026, Shift 2, Physics Q41

Question 41 of 75 in this shift, Physics question 16 of 25, Section A.

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 minimum value of

n_2

required for total internal reflection from painted face is

The figure, in words

[figure: equilateral prism with light ray entering from left, bottom face painted with

n_2

]

(1) $3\sqrt{3}/1.6$
(2) $\sqrt{3}$
(3) $3.2/\sqrt{3}$
(4) $4\sqrt{3}/5$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Ray Optics and Optical Instruments
Topic: Prism Deviation
Idea tested: TIR at Second Face Condition

Same idea in other shifts

Asked 2× in all

3 Aug 2021, Shift 1 · Q30A ray of monochromatic light is incident on one refracting face of prism of angle 75°. It passes through the prism and is incident on the…MediumNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.