Question:

In a double slit experiment shown in figure, when
light of wavelength 400 nm is used, dark fringe is
observed at P. If D = 0.2 m. the minimum distance
between the slits S1
and S2 is ______ mm.

                                                       JEE-2024       

Solution:                
In a double slit experiment shown in figure, when light of wavelength 400 nm is used, dark fringe is observed at P. If D = 0.2 m. the minimum distance between the slits S1 and S2 is ______ mm.

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