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>> $Two coherent monochromatic light beams o$

Question

Two coherent monochromatic light beams of intensities $I$ and $4 I$ are superposed. The maximum and minimum possible resulting intensities are :

A

$5 I$ and $0$

B

$5 I$ and $3 I$

C

$9 I$ and $I$

D

$9 I$ and $3 I$

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Updated on : 2022-09-05

Solution

Verified by Toppr

Correct option is C)

Maximum intensity, $I_{m a x} = (I_{1} + I_{2})^{2}$
$= (I + 4 I)^{2}$
$= 9 I$
Minimum intensity $I_{m i n} = (I_{1} - I_{2})^{2}$
$(I - 4 I)^{2}$
$= I$

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