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A thin equiconvex glass lens (mu(1) = 1....

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

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