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In Young's experiment the wavelenght of ...

In Young's experiment the wavelenght of red light is `7.8xx10^(-5) cm ` and that of blue light is `5.2xx10^(-5)` cm. The value of n for which `(n+1)^(th)` blue bright band coincides with `n^(th)` red band is

A

`4`

B

`3`

C

`2`

D

`1`

Text Solution

Verified by Experts

The correct Answer is:
C
`n_(1)lambda_(1)=n_(2)lambda_(2)impliesn(7.8xx10^(-5))=(n+1)(5.2xx10^(-5))` or `n(2.6xx10^(-5))=5.2xx10^(-5),:.n=2`
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