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In a Young's double-slit experiment usin...

In a Young's double-slit experiment using slits of unequal widths, the intensities on the screen due to the slits are in the ratio `4 : 9` when the slits are used separately. When they are used together, the ratio of the intensity at a dark fringe to the intensty at a bright fringe on the screen will be

A

`4 : 9`

B

`1 : 9`

C

`9 : 16`

D

` 1 : 25`

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The correct Answer is:
D
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