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Q.

Interference pattern is obtained with two coherent light sources of intensity ratio 'b'.  In the interference pattern, the ratio of  Imax−IminImax+Imin   will be

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a

b(b+1)

b

2b(b+1)

c

b(b+1)2

d

[b+1b−1]2

answer is B.

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Detailed Solution

The given values are Intensity I1=b Intensity I2=1 Imax−IminImax+Imin=(I1+I2)2−(I1−I2)2(1+I2)2+(I1−I2)2                       =4.I1.I22(I1+I2)                       =2I1.I2I1+I2                      =2b1b+1 ∴ Imax−IminImax+Imin =2bb+1
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