In the given figure. The radius of curvature of curved surface for both the plano-convex and plano- concave lens is 10 cm and refractive index for both is 1.5. The location of the final image after all the refractions through lenses is :
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: The focal length of the plano – convex lens is
Focal length of plano –concave lens is
Since parallel beams are incident on the lens, its image from plano – concave lens will be formed at + 20 cm from it (at the focus) and will act as an object for the plano – concave lens. Since the two lens are at a distance of 10 cm from each other, therefore, for the next lens u = + 10 cm.
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