The concave surface of a thin concavo-convex lens of index`1.5`has radius of curvature `50cm` and`10cm` respectively.The concave

The concave surface of a thin concavo-convex lens of index`1.5`has radius of curvature `50cm` and`10cm` respectively.The concave side is silvered andplaced on a horizontal surface as shown

Focal length of lens(without silvered)is:
A. `25cm`
B. `20cm`
C. `10cm`
D. `5cm`

The concave surface of a thin concavo-convex lens of index`1.5`has radius of curvature `50cm` and`10cm` respectively.The concave side is silvered andp

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