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JEE Main 6 April 2023, Shift 1, Physics Q36

Question 36 of 90 in this shift, Physics question 6 of 30, Section A.

A monochromatic light wave with wavelength

\lambda_1

and frequency

\nu_1

in air enters another medium. If the angle of incidence and angle of refraction at the interface are

45^\circ

and

30^\circ

respectively, then the wavelength

\lambda_2

and frequency

\nu_2

of the refracted wave are:

(1) $\lambda_2=\sqrt2\lambda_1,\ \nu_2=\nu_1$
(2) $\lambda_2=\frac{1}{\sqrt2}\lambda_1,\ \nu_2=\nu_1$ Official answer
(3) $\lambda_2=\lambda_1,\ \nu_2=\frac{1}{\sqrt2}\nu_1$
(4) $\lambda_2=\lambda_1,\ \nu_2=\sqrt2\nu_1$

Official answer

Option 2

NTA final key.

Chapter: Ray Optics and Optical Instruments
Topic: Refraction and Snell's Law
Idea tested: Relative Refractive Index and Wave Parameters

Same topic in other shifts

All Refraction and Snell's Law questions

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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.