In an interference pattern the (n+4)^(th...

In an interference pattern the `(n+4)^(th)` blue bright fringe and `n^(th)` red bright fringe are formed at the same spot. If red and blue light have the wavelength of `7800Å` and `5200 Å` then value of n should be-

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The correct Answer is:

`D/d (n+4 ) lambda_(B)=D/d n lambda_(R)`
`(n+4) 5200 = n 7800 `
n=8

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