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A beam of light consisting of two wavelength `6300 A^(@)` and `lambda A^(@)` is used to obtain interference frings in a Young's double slit experiment. If `4^(th)` bright fringe of `6300 A^(@)` coincides with `5^(th)` dark fringe of `lambdaA^(@)`, the value of `lambda`(in`A^(@)`) is

A

`5200`

B

`4800`

C

`6200`

D

`5600`

Text Solution

Verified by Experts

`4xx6300=(9)/(2)lambda`
`rArr lambda=8xx700=5600A^(@)`
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