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Two monochromatic coherent point sources...

Two monochromatic coherent point sources `S_(1)` and `S_(2)` are separated by a distance L. Each sources emits light of wavelength `lambda`, where `L gt gt lambda`. The line `S_(1) S_(2)` when extended meets a screen perpendicular to it at point A. Then

A

The interference fringes on the screen are circular in shape

B

The point `A` is an intensity maximum if L = n `lambda` (n = integer).

C

The interference fringes on the screen are straight lines perpendicular of the lines `S_1 S_2 A`

D

both (a) & (b)

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The correct Answer is:
D
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