Optics 6 Question 41

43. In Young’s double-slit experiment, the two slits act as coherent sources of equal amplitude A and of wavelength λ. In another experiment with the same set-up the two slits are sources of equal amplitude A and wavelength 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 ……

(1986,2M)

True / False

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Solution:

  1. In case of YDSE, at mid-point intensity will be Imax=4I0 In the second case when sources are incoherent, the intensity will be I=I0+I0=2I0

Therefore, the desired ratio is

4I02I0=2

Here, I0 is the intensity due to one slit.



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