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Q.

Light from two coherent sources of same amplitude and same wavelength illuminates the screen. The intensity of the central maximum is I. If the sources were noncoherent, the intensity at the same point will be

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a

$I / \sqrt{2}$

b

I/2

c

3I/4

d

I

answer is A.

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Detailed Solution

detailed_solution_thumbnail

For two coherent sources $I = n^{2} I_{0} = 4 I_{0}$
For non coherent sources $I^{'} = {nI}_{0} = 2 I_{0}$
There fore $I' = \frac{I}{2}$

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