In Young's double slit experiment the two slits act as coherent sources of equal amplitude A & wavelength λ . In another experiment with the same set up the two slits are source of equal amplitude A & wavelength λ but are incoherent. The ratio of intensity of light at the mid point of the screen into the first case to that in second case.
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Ans. 2
Sol. When coherent then Δ x at centre = 0
∴ I net = 4I
when Incoherent
= I + I = 2I
Ratio = 
= 
= 2
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