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Two coherent monochromatic light beams o...

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

A

`9I` and `I`

B

`9I` and `3I`

C

`5I` and `I`

D

`5I` and `3I`.

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