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Light from a point source placed at the bottom of a rectangular glass slab of thickness 5 cm is internally reflected by the upper surface and a circle of radius 8 cm is formed at the bottom. Find the R.I. of glass

Light from a point source placed at the bottom of a rectangular glass slab of thickness 5 cm is internally reflected by the upper surface and a circle of radius 8 cm is formed at the bottom. Find the R.I. of glass

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