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Question

In the figure, if a parallel beam of white light is incident on the plane of the slits, then the distance of the nearest white spot on the screen from O is [assume d<<D,λ<<d]

164542_69decbeb7d9f41ab8367fbcf104f069e.png

A
0
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B
d/2
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C
d/3
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D
d/6
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Solution

The correct option is D d/6
The central bright white fringe wold be located at midway between the two slits at point O' as shown in figure.
Distance between O and O' =2d3d2=d6


406213_164542_ans_69a59484853947dc8af4fd4126898ad5.png

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