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

`1 : 2`

`2 : 1`

`1 : 4`

`4 : 1`

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