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Question

The maximum intensity produced by two coherent sources of intensity I1 and I2 constructively will be:

A
II+I2
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B
I2I+I22
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C
II+I2+2I1I2
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D
zero
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Solution

The correct option is C II+I2+2I1I2
If the angle between two coherent sources is θ then the Intensity after Interference is given by I1+I2+2I1I2cosθ. For constructive Interference θ=2nπ Thus Intensity is I1+I2+2I1I2

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