Question

Two plano-convex lenses are placed in contact such that their curved surfaces are
facing each other. The radius of curvature of the curved surfaces are 10 cm and 15 cm
respectively. The space between them is filled with water of refractive index 4/3. If the
refractive index of glass is 3/2, find the focal length of the combination.​

Answer 1

Answer:

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