Wave OpticsHard
Question
If the ratio of the intensity of two coherent sources is 4 the visibility [(Imax - Imin) / (Imax + Imin)] of the fringes is
Options
A.4
B.4 / 5
C.3 / 5
D.9
Solution
Given 
= 4 ∴ I1 = 4I (let the I2 - I)
Imax = (√ I1 + √I2)2 = (2√ I + √I)2 = 9I
Imin = (√ I1 - √I2)2 = (2√ I - √I)2 = I
∴
= 4 ∴ I1 = 4I (let the I2 - I)Imax = (√ I1 + √I2)2 = (2√ I + √I)2 = 9I
Imin = (√ I1 - √I2)2 = (2√ I - √I)2 = I
∴
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