When two coherent 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
4 : 1
b
1 : 4
c
9 :25
d
25 : 9
answer is D.
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Detailed Solution
The given values are Amplitude a1=A Amplitude a2=4A ∴ImaxImin=[a1+a2a1−a2]2 =[A+4AA−4A]2 ∴ ImaxImin=259