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In a Young’s experiment, let lights of l...

In a Young’s experiment, let lights of `lambda= 5.48 xx 10^-7 m` and `6.85 xx 10^-8 m` be used in turn keeping D and `d` constant. Compare the fringe widths in the two cases.

A

`1 : 8`

B

`8 : 1`

C

`4 : 1`

D

`1 : 6`.

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