First slide

Coherent sources and their importance in interference

Question

The ratio of intensities of two waves is 9 : 1. They are producing interference. The ratio of maximum and minimum intensities will be

Easy

A

10 : 8
B

9 : 1
C

4 : 1
D

2 : 1

Solution

$\frac{I_{max}}{I_{min}} = {(\frac{\sqrt{\frac{I_{1}}{I_{2}}} + 1}{\sqrt{\frac{I_{1}}{I_{2}}} - 1})}^{2} = {(\frac{\sqrt{\frac{9}{1}} + 1}{\sqrt{\frac{9}{1}} - 1})}^{2} = \frac{4}{1}$

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