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The curvature radii of a concavo-convex ...

The curvature radii of a concavo-convex glass lens are `20cm`and `60cm`. The convex surface of the lens is silvered .With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is (`mu`of glass=`1.5,mu`of water=`4//3`

A

`(90)/(13)cm`

B

`(80)/(13)cm`

C

`(20)/(3)cm`

D

`(45)/(8)cm`

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The correct Answer is:
A
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