Задача id10133

A biconvex lens is made from two identical thin watch glasses, the space between which is filled with water. The optical power of such a lens is 4 diopters. Determine the optical power of a plano-concave lens consisting of one thin watch glass touching the bottom of a thin-walled cylindrical glass vessel, if the space between the watch glass and the bottom of the vessel is also filled with water.

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