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Two coherent monochromatic light beams o...

Two coherent monochromatic light beams of intensities I and `4I` are superposed. The maximum and minimum possible intensities in the resulting beam are

A

5l and I

B

5I and 3I

C

9I and I

D

9I and 3I

Text Solution

Verified by Experts

The correct Answer is:
C
`I_("max") = ( sqrt(I_(1))+sqrt(I_(2)))^(2) = ( sqrt(I) + sqrt( 4I))^(2) = 9 I`
`I_("min") = (sqrt(I_(1)) - sqrt(I_(2)))^(2) = ( sqrt(4I) - sqrt(I))^(2) I`
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