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The distance between two coherent source...

The distance between two coherent sources is 1 mm. The screen is placed at a distance of 1 m from the sources. If the distance of the third bright fringe is `1.2` mm from the central fringe, the wavelength of light used is

A

`4000 Å`

B

`5000 Å`

C

`6000 Å`

D

`7200 Å`

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The correct Answer is:
A
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