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Q.

The ratio of intensities of two coherent sources is p. In the interference pattern, visibility of fringes will be

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a

p/(1+p)

b

2p/(1+p)

c

p/(1+p)

d

2p/(1+p)

answer is B.

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Detailed Solution

The fringe visibility V is given  byV=Imax−IminImax+Imin Given I1I2=p=a1a22  or  a1a2=p  V=2I1I2I1+I2=2I1/I2I1/I2+1=2p(p+1)
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