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Question
In Young's double-slit experiment, the screen is moved away from the plane of the slits. What will be its effect on the following?
- The angular separation of the fringes.
- Fringe-width.
Options
Both (i) and (ii) remain constant.
(i) remains constant, but (ii) decreases.
(i) remains constant, but (ii) increases.
Both (i) and (ii) increase.
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Solution
(i) remains constant, but (ii) increases.
Explanation:
When the screen is moved away 'D' increases and we know `beta = (lambdaD)/d`
So, if D increases, fringe-width (β) also increases and angular separation `(lambda/d)` remains the same.
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