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Question

The interference pattern is obtained with two coherent light source of intensity ratio n. In the interference pattern, the ratio ImaxIminImax+Imin will be

  1. 2n(n+1)2
  2. nn+1
  3. 2nn+1
  4. n(n+1)2

A
2nn+1
B
n(n+1)2
C
2n(n+1)2
D
nn+1
Solution
Verified by Toppr

Given : I2=nI1
Maximum intensity of interference Imax=(I1+I2)2
Imax=(I1+nI1)2=(1+n)2I1=(1+n+2n)I1

Minimum intensity of interference Imin=(I1I2)2
Imin=(I1nI1)2=(1n)2I1=(1+n2n)I1

ImaxIminImax+Imin=2n(2n)2(1+n)=2n1+n

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