Wave Optics | JEE Main 2025 Solution | YDSE Fringes

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JEE MAIN 2025

22-01-2025 SHIFT-2

Question

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In Young's double slit experiment, the fringes produced by red light are closer as compared to those produced by blue light.
Reason (R): The fringe width is directly proportional to the wavelength of light.

Select the correct option:

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

$\begin{aligned} & \beta=\frac{\lambda \mathrm{D}}{\mathrm{d}} \& \lambda_{\mathrm{R}}>\lambda_{\mathrm{b}} \\ & \therefore \beta_{\mathrm{R}}>\beta_{\mathrm{b}}\end{aligned}$

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