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`.)

In the YDSE, the monochromatic source of wavelength `lambda` is placed

1.	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`.)
Answer» Correct Answer - [(a) 4 mm above 0; (b) 20; (c ) 2000 `Å`]

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