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A biconvex lens (mu=1.5) has radius of c...

A biconvex lens `(mu=1.5)` has radius of curvature `20cm` (both).
find its focal length.

Text Solution

Verified by Experts

The correct Answer is:
B, C
`R_1=+20cm, R_2=-20cm, mu=1.5`
Substituting the values in the equation
`(1)/(f)=(mu-1)((1)/(R_1)-(1)/(R_2))`, we have
`1/f=(1.5-1)(1/20-1/-20)`
or `f=+20cm`
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