Two interfering waves are arriving at a ...

Two interfering waves are arriving at a point on a screen with a path difference of `120 lamda`. The path difference is `72 mu m`. The wavelength of light is ____________. Is the point dark or bright?

A

`6000Å`, bright

B

`8640Å`, bright

C

`8640Å`, dark

D

`6000Å`, dark

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The correct Answer is:

A

NA

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