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In Young's experiment the wavelength of ...

In Young's experiment the wavelength of red light is `7.5xx10^(-5)`cm.and that of blue light `5.0xx10^(-5)`.The value of n for which `(n+1)^(th)`the blue bright band coincides with`n^(th)`red band is -

A

8

B

4

C

2

D

1

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