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When two coherent monochromatic light beams of intensities l and 4l are superimposed, the ratio between maximum and minimum intensities in the resultant beam is

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1:4

1: 9

4:1

9:1

answer is A.

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Detailed Solution

\frac{{{I_1}}}{{{I_2}}} = \frac{I}{{4I}} = \frac{1}{4} \Rightarrow

=\frac{\left ( \sqrt{I_1}+\sqrt{I_2} \right )^2}{\left (\sqrt{I_1}-\sqrt{I_2} \right )^2}

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