First slide

Coherent sources and their importance in interference

Question

Light waves producing interference have their amplitudes in the ratio 3 : 2. The intensity ratio of maximum and minimum of interference fringes is

Easy

A

36 : 1
B

9 : 4
C

25 : 1
D

6 : 4

Solution

$\frac{I_{max}}{I_{min}} = {(\frac{\frac{a_{1}}{a_{2}} + 1}{\frac{a_{1}}{a_{2}} - 1})}^{2} = \frac{25}{1}$

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