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Question

# Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible resulting intensities are :5I and 05I and 3I9I and I9I and 3I

A
9I and 3I
B
5I and 0
C
5I and 3I
D
9I and I
Solution
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#### Maximum intensity, Imax=(√I1+√I2)2=(√I+√4I)2=9IMinimum intensity Imin=(√I1−√I2)2(√I−√4I)2=I

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