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A point P is situated at 40.1 cm and 40....

A point P is situated at 40.1 cm and 40.2 cm away from two coherent sources. If the wavelength of light used is 5000 Å, then the point P

A

is dark

B

is bright

C

neigher bright nor dark

D

may be bright or dark

Text Solution

Verified by Experts

The correct Answer is:
B
Path difference `=0.1cm=nlamda`.
`therefore 0.1xx10^(-2)=nxx5xx10^(-7)`
`therefore n=2000`, it is a bright point.
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