When two coherent monochromatic light beams of intensities I and 4I are superimposed, the ratio between maximum and minimum intensities in the resultant beam is
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a
9:1
b
1:9
c
4:1
d
1:4
answer is A.
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Detailed Solution
The given values are I1=I, I2=4I ImaxImin=[I1+I2I1−I2]2 =[I+4II−4I]2 =[I+2II−2I]2 =9II ∴ ImaxImin=91