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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/2

b

I/2

c

3I/4

d

I

answer is A.

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Detailed Solution

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For two coherent sources I=n2I0=4I0
For non coherent sources I'=nI0=2I0
There fore I'=I2

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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