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A long cylindrical tube containing water...

A long cylindrical tube containing water in closed by an equinvex lens of focal length 10 cm in air. A point source is placed along the axis of the tube outside it at a distance of 21 cm from the lens. Locate the final image of the source. Refractive index of the materials of the lens `=1.5 ` and that of water `=1.33.`

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