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Q.

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

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a

1 : 4

b

9 :25

c

25 : 9

d

4 : 1

answer is D.

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Detailed Solution

ImaxImin=A1+A2A1−A22=A+4AA−4A2=259

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