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Question

In Young's double-slit experiment, the slit width and the distance of slits from the screen both are doubled. The fringe width


A

increases

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B

decreases

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C

remains unchanged

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D

none of the above

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Solution

The correct option is C

remains unchanged


Explanation:

Fringe width is the measure of distance between two adjacent bright/dark fringes. This is represented as β=Dλd, where D is the distance between the slit source and the screen, and d is the slit separation. The width of the fringe will not vary as both D and d are enlarged to the same extent.

Hence, option C is the correct answer.


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