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Q.

If ratio of intensity of two coherent light sources is given 2x, then find out value ofImax−IminImax+Imin

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a

22x2x+1

b

2x2x+1

c

22x2x−1

d

2x2x+1

answer is A.

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Detailed Solution

Imax=I1+I22&Imin=I1−I22 ImaxImin=(2x+1)2(2x−1)2 Imax-IminImax+Imin=2x+12-2x-122x+12+2x-12 ⇒2x−1+2x−2x−1+22x2x+1+22x+2x+1−22x⇒42x4x+2=22x2x+1
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If ratio of intensity of two coherent light sources is given 2x, then find out value ofImax−IminImax+Imin