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Q.

Two coherent light sources having intensity in the ratio 2x  produce an interference pattern. The ratio  Imax−IminImax+Imin will be:

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a

2xx+1

b

22xx+1

c

2x2x+1

d

22x2x+1

answer is D.

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Detailed Solution

Given : l1l2=2x⇒I1=2xI2 Now, Imax=I1+I22=I1+I2+2l1I2Imin=I1−I22=I1+I2−2l1I2∴Imax−IminImax+Imin=4I1I22I1+I2=42xI2I222xI2+I2=22x(2x+1)
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