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Diameter of the flat surface of a circul...

Diameter of the flat surface of a circular plano-convex lens is `6 cm` and thickness at the centre is `3 mm.` The radius of curvature of the curved part is

A

`15 cm`

B

`20 cm`

C

`30 cm`

D

`10 cm`

Text Solution

Verified by Experts

The correct Answer is:
A
`MC=QC-QM=(R-0.3) cm`
`PC^2=MC^2+PM^2`
`R^2=(R-0.3)^2+(3)^2`

Solving this equation, we get
`R=15 cm`
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