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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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MOTION-RAY OPTICS-Exercise-2
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