JEE Main 2022PhysicsRay OpticsEasyMCQ

JEE Main 2022 — Ray Optics Question with Solution

JEE Main 2022 (25 Jun Shift 1)

Question

A light wave travelling linearly in a medium of dielectric constant 4, incidents on the horizontal interface separating medium with air. The angle of incidence for which the total intensity of incident wave will be reflected back into the same medium will be :
(Given : relative permeability of medium μr=1)

Choose an option

Show full solutionCorrect option: D
Correct answer
D60°

Step-by-step explanation

Relative refractive index is μ=μrεr=4×1=2

Now, for complete reflection, θ>θc, where, θc is critical angle.

Now, critical angle is sinθc=1μ=12

 ⇒θc=sin-112⇒θc=30°

So, the angle of incidence for which the total intensity of incident wave will be reflected back into the same medium is θ>30° i.e., 60°.

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About this question

This is a previous-year question from JEE Main 2022, covering the Ray Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.