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Sahay Sir > Question Answers > MTG NEET Physics > Part 2 > Chapter 10 - Wave Optics > A thin plastic sheet of refractive index 1.6 is used to cover one of slits of a double slit arrangement for the Young’s experiment. When the double slit is illuminated by monochromatic light (wavelength = 5867 A) the centre of the screen appears dark rather than bright. The minimum thickness of the plastic sheet to be used for this to happen is

A thin plastic sheet of refractive index 1.6 is used to cover one of slits of a double slit arrangement for the Young’s experiment. When the double slit is illuminated by monochromatic light (wavelength = 5867 A) the centre of the screen appears dark rather than bright. The minimum thickness of the plastic sheet to be used for this to happen is

The path difference between two interfering light waves meeting at a point on the screen is (87/2)λ. The band obtained at that point is