In the YDSE the monochromatic source of wavelength λ is pla…

Physics Wave Optics Young's Double Slit Experiment MCQ (Single Correct)

In the YDSE the monochromatic source of wavelength λ 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 .

Find the position of the central maxima

Find the order of interference formed at O

Now S is placed on centre of dotted line. Find the minimum thickness of the film of refractive index μ = 1.5 to be placed infront of S 2 so that intensity at O becomes 3/4 th of the maximum intensity. Take λ = 6000Å ; d = 6 mm.

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4 mm above O

2000Å

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