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In young's double slit experiment 'the w...

In young's double slit experiment 'the wavelength of red light is`7800Å` and that of blur light is `5200Å`.the value of n of which`nth` bright band due to red light coincides with (n+1)bright band due to blue light is:

A

`1`

B

`2`

C

`3`

D

`4`

Text Solution

Verified by Experts

The correct Answer is:
B
`nbeta_(R)=(n+1)beta_(V)`
`nlambda_(R )(D)/(d)=(n+1)lambda_(v)(D)/(d)`
`nxx7800Å=(n+1)xx5200Å`
`6n=4(n+1)`
`6n=4n+4`
`2n=4`
`n=2`
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