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In a Young's double slit experiment, the...

In a Young's double slit experiment, the fringe width will remain same, if ( D = distance between screen and plane of slits, d = separation between two slits and `lambda` = wavelength of light used)

A

Both `lambda ` and D are doubled

B

Both d and D are doubled

C

D is doubled but d is halved

D

` lambda ` is doubled but d is halved

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The correct Answer is:
B
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