A thin equiconvex glass lens `(mu_(1) = 1.5)` of radius of curvature \'R\' and a thin plano-concave
Channel: Doubtnut
Date: 26/01/2020

A thin equiconvex glass lens `(mu_(1) = 1.5)` of radius of curvature \'R\' and a thin plano-concave lens `(mu_(2) = 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