In Young's double slit experiment, the w...

In Young's double slit experiment, the wavelength of red light is `5200 Å`. The value of n for which nth bright band due to red light coincides with `(n+1)th` bright band due to blue light`(lambda=7800Angstrom)`, is

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The correct Answer is:

`nxxlambda_(R)=(n+1)lambda_(B)`
`nxx7800=(n+1)xx5200`
`6n=4n+4 implies n=2`

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