JEE Main 2026 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 6 April 2026, Shift 1, Physics Q36

Question 36 of 75 in this shift, Physics question 11 of 25, Section A.

In interference experiment the path difference between two interfering waves at a point

A

on the screen is

\lambda/3

, where

\lambda

is the wavelength of these waves, and at another point

B

the path difference is

\lambda/6

. The ratio of intensities at points

A

and

B

is ________.

(1)3
(2)4
(3)1/3Official answer
(4)1/4

Official answer

Option 3

NTA final key.

Chapter: Wave Optics
Topic: Young's Double Slit
Idea tested: Intensity at Fractional Path Differences

Same idea in other shifts

Asked 5× in all

2 Apr 2026, Shift 2 · Q46In a Young's double slit experiment, the intensity at some point on the screen is found to be $\frac{3}{4}$ times of the maximum of the…MediumNumerical value
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9 Apr 2024, Shift 1 · Q59In a Young's double slit experiment, the intensity at a point is $\left(\frac{1}{4}\right)^{th}$ of the maximum intensity, the minimum…MediumNumerical value
6 Sep 2020, Shift 2 · Q24A Young's double-slit experiment is performed using monochromatic light of wavelength $\lambda$ . The intensity of light at a point 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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.