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In two separate set-ups of the Young's d...

In two separate set-ups of the Young's double slit experiment, fringes of equal width are observed when lights of wavelength in the ratio of `1:2` are used. If the ratio of the slit separation in the two cases is `2:1`, the ratio of the distance between the plane of the slits and the screen in the two set-ups are

A

`4:1`

B

`1:1`

C

`1:4`

D

`2:1`

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The correct Answer is:
A
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