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  • Why are coherent sources necessary to produce interference in Young’s double slit experiment? Light waves from two coherent sources have intensities in the ratio of 4:9. Find the ratio of intensities of maxima and minima in the interference patte

Why are coherent sources necessary to produce interference in Young’s double slit experiment? Light waves from two coherent sources have intensities in the ratio of 4:9. Find the ratio of intensities of maxima and minima in the interference pattern.

 

 

 
 
 
 
 

Answers (1)

Coherent sources are required to ensure that the position of minima and maxima do not change.

\frac{A_{1}}{A_{2}}=\sqrt{\frac{I_{1}}{I_{2}}}

        =\sqrt{\frac{4}{9}}=\frac{2}{3}

A_{max}=A_{1}+A_{2}=5 \; units

A_{min}=A_{2}-A_{1}=1 \; units

\frac{I_{max}}{I_{min}}=\frac{A^{2}_{max}}{A_{min}^{2}}=\frac{25}{1}

Posted by

Safeer PP

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