In Young’s double slit experiment, the two slits act as coherent sources of equal amplitude A and wavelength λ λ . In another experiment with the same set up the two slits are of equal amplitude A and wavelength λ λ but are incoherent. The ratio of the intensity of light at the mid-point of the screen in the first case to that in the second case is
Text Solution
Verified by ExpertsThe correct answer is:
B
Resultant intensity 
At central position with coherent source (and 
... (i)
In case of incoherent at a given point, φ φ varies randomly with time so (cos φ φ ) av = 0
∴ ∴ 
... (ii)
Hence 
.
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