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In a biprism experiment , the distance b...

In a biprism experiment , the distance between the virtual images of the slits is 2.5 mm and the eyepiece is at a distance of 1 m from the slits . If the fringe width is 0.3 mm then the frequency of source of light is

A

`4 xx 10^14 Hz`

B

`2 xx 10^15 Hz`

C

`4 xx 10^12 Hz`

D

`2 xx 10^12 Hz`

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