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In the YDSE, the monochromatic source of...

In the YDSE, the monochromatic source of wavelength `lambda` is placed at a distance `d/2` from the central axis (as shown in the figure), where d is the separation between the two slits `S_1 and S_2` .

(a)Find the position of the central maxima.
(b) Find the order of interference formed at O.
(c)Now, S is placed on centre dotted line. Find the minimum thickness of the film of refractive indes `mu =1.5` to be placed in front of `S_2` so that intensity at O becomes `3/4`th of the maximum intensity.
(Take `lambda=6000Å, d = 6mm`.)

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Knowledge Check

  • Two points nonochromatic and coherent sources of light of wavelength lambda each are placed as shown in figure. The initial phase difference between the sources is zero O. (d gt gt d) . Mark the correct statement(s).

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