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The disntances of poinnt on the screen f...

The disntances of poinnt on the screen from two slits are `1.8xx10^(-5)m and 1.23xx10^(-5)m`. If the wavelength of light used is 6000 Å, then the number of bright or dark band formed at that point is

A

10th dark

B

10th bright

C

8th dark

D

9th bright

Text Solution

Verified by Experts

The correct Answer is:
A
`(1.8-1.23)xx10^(-5)=0.57xx10^(-5)m`
`therefore 0.57xx10^(-5)=nlamda`
`therefore n=(0.57xx10^(-5))/(6xx10^(-7))=(19)/(2)=9.5`
This corresponds to 10th dark band.
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