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Young's double-slit experiment setup wit...

Young's double-slit experiment setup with ligth of wavelength `lambda = 6000 Å`, distance between two slit in 2 mm and distance between the plane of slits and the screen. Is 2 m. The slits are of equal intensity. When a sheet of glass of refractive index 1.5 (which permtis only a fraction `eta` of the incident light to pass through) and thickness `8000 Å` is placed in front of the lower slit, it is observed that the intensity at a point P, 0.15 mm above the central maxima, does not change.

The phase difference at point P without inserting the slab is

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Young's double-slit experiment setup with ligth of wavelength lambda = 6000 Å , distance between two slit in 2 mm and distance between the plane of slits and the screen. Is 2 m. The slits are of equal intensity. When a sheet of glass of refractive index 1.5 (which permtis only a fraction eta of the incident light to pass through) and thickness 8000 Å is placed in front of the lower slit, it is observed that the intensity at a point P, 0.15 mm above the central maxima, does not change. The value of eta is

Young's double-slit experiment setup with ligth of wavelength lambda = 6000 Å , distance between two slit in 2 mm and distance between the plane of slits and the screen. Is 2 m. The slits are of equal intensity. When a sheet of glass of refractive index 1.5 (which permtis only a fraction eta of the incident light to pass through) and thickness 8000 Å is placed in front of the lower slit, it is observed that the intensity at a point P, 0.15 mm above the central maxima, does not change. The value of eta is

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