A thin equiconvex glass lens 1 5 of radius of curvature R and a thin...
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A thin equiconvex glass lens 1 5 of radius of curvature R and a thin plano concave lens u 1 4 are kept in contact and the plane surface is silvered This lens system is placed in air When a point object is placed at a distance 20 cm from the lens system on its principal axis the image formed by the lens system coincides with the object Then the value of radius of curvature R is A 12 cm C 24 cm B 18 cm D 30 cm 1 5 H 1 4
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