- #1

fluidistic

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## Homework Statement

Determine the focal length of a plano-concave lens (n=1.5) which has a radius of curvature of 10 cm. What is its power in diopters?

## Homework Equations

None given.

## The Attempt at a Solution

1/f=(n-1)(1/R_1-1/R_2)=(1/2)(-0.1)=-1/20.

Thus f=5 cm and P=-20 m^(-1).

Is this right?