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Single Slit Diffraction

Two coherent ...

Question

Two coherent lights beams of intensity $I$ and $4 I$ are superposed. The minimum and maximum possible intensities in the resultant beam are :

A

9 I

and

I

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B

9 I

and

3 I

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C

5 I

and

I

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D

5 I

and

3 I

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Solution

The correct option is A $9 I$ and $I$
$\frac{I_{m a x}}{I_{m i n}} = (\frac{\sqrt{4 I} + \sqrt{I}}{\sqrt{4 I} - \sqrt{I}})^{2} = \frac{9}{1}$

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