CBSE 12th Physics Delhi Set 1 - 2024

MCQ (Single Correct Answer)

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A Young's double-slit experimental set up is kept in a medium of refractive index $\left(\frac{4}{3}\right)$. Which maximum in this case will coincide with the $6^{\text {th }}$ maximum obtained if the medium is replaced by air?

$4^{\text {th }}$

$6^{\text {th }}$

$8^{\text {th }}$

$10^{\text {th }}$

CBSE 12th Physics Delhi Set 1 - 2024

MCQ (Single Correct Answer)

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Assertion (A): In a Young's double-slit experiment, interference pattern is not observed when two coherent sources are infinitely close to each other.

Reason (R): The fringe width is proportional to the separation between the two sources.

If both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).

If both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A).

If Assertion (A) is true but Reason (R) is false.

If both Assertion (A) and Reason (R) are false.

CBSE 12th Physics Delhi Set 1 - 2023

MCQ (Single Correct Answer)

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In a Young's double-slit experiment, the screen is moved away from the plane of the slits. What will be its effect on the following?

(i) Angular separation of the fringes.

(ii) Fringe-width.

Both (i) and (ii) remain constant.