Two coherent point sources S1 and S2 vi...

Two coherent point sources `S_1 and S_2` vibrating in phase emit light of wavelength `lamda` . The separation between them is `2lamda` . The light is collected on a screen placed at a distance `Dgt gt lamda` from the slit `S_1` as shown. The minimum distance, so that intensity at P is equal to the intensity at O

`sqrt2D`

`sqrt3D`

`sqrt8D`

`sqrt5D`

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