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In Youngs experiment the wavelength of r...

In Youngs experiment the wavelength of red light is `7.5 xx 10^-5 cm` and that of blue light is `5.0 xx 10^-5 cm`. The value of `n` for which `(n+ 1)th` blue bright band coincides with `nth` red band is:

A

8

B

4

C

2

D

1

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