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The curvature radii of a concavo-convex glass lens are `20cm`and `60cm`.th convex surface of the lens is silvered .With the lens horizotnal ,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//3cm`

D

`45//8cm`

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