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CHC The radius of curvature of each surf...

CHC The radius of curvature of each surface of an equiconvex lens is R = 42 cm. Refractive index of the glass = 1.25. If the final image forms after four internal reflections (but not TIR) inside the lens (for paraxial ray incident beam parallel to principal axis) calculate the distance of the image from the lens, in cm.

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