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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.
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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