First slide

Coherent sources and their importance in interference

Question

In Young’s experiment, the ratio of maximum to minimum intensities of the fringe system is 4 : 1. The amplitudes of the coherent sources are in the ratio

Easy

A

4 : 1
B

3 : 1
C

2 : 1
D

1 : 1

Solution

$\frac{I_{max}}{I_{min}} = \frac{{(\frac{a_{1}}{a_{2}} + 1)}^{2}}{{(\frac{a_{1}}{a_{2}} - 1)}^{2}} = \frac{4}{1} \Rightarrow \frac{a_{1}}{a_{2}} = \frac{3}{1}$

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