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Light from two coherrent sources of same...

Light from two coherrent sources of same amplitude `(A)` and wavelength `(lambda)` illuminates the screen. The intensity of central maximum is `I_0`. If the source were incoherent, the intensity at the same point will be :

A

`I_0`

B

`I_0//2`

C

`4 I_0`

D

`2 I_0`.

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