CBSE Class 12 Physics 2023 Outside Delhi Set 1 Paper

Question : 18

Total: 35

Assertion (A): In Young's double slit experiment all fringes are of equal width.
Reason (R): The fringe width depends upon wavelength of light (λ) used, distance of screen from plane of slits (D) and slits separation (d).

Both Assertion (A) and Reason (R) are true and Reason ( R ) is the correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (A).
Assertion (A) is true and Reason (R) is false.
Assertion (A) is false and Reason (R) is also false.

Solution: 👈: Video Solution

Interference fringe width =β=λD∕d It depends on wavelength of light used, distance between slits and distance of screen from the slit only. Hence, all fringes have equal width.
So, assertion and reason both are true and the reason explains the assertion.

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