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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 $$d<<D,\lambda<<d$$]

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' $$= \dfrac { 2d }{ 3 } -\dfrac { d }{ 2 } =\dfrac { d }{ 6 } $$ 


406213_164542_ans_69a59484853947dc8af4fd4126898ad5.png

Physics

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