In a Young's double-slit experiment, the screen is moved ...

CBSE Class 12 Physics 2023 All Sets Paper

Question : 6 of 18

Marks: +1, -0

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.
(i) remains constant, but (ii) decreases.
(i) remains constant, but (ii) increases.
Both (i) and (ii) increase

Solution:

We know that, Young's double slit experiment,
fring-width

β = \;{λ D}/{d}

where D = Distance between screen and slit
Angular separation of the fringes

θ = \;{λ}/{d}

Fringe width increase but angular separation remain constant.

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