# Chapter 34 - Images - Problems: 20c

$r=+32cm$

#### Work Step by Step

Using the relation between focal length and radius of curvature: $$f=\frac{r}{2}$$ Rearranging the equation to make $r$ the subject of the formula:$$r=2f$$ Substituting the known value of $f=+16cm$ yields a radius of curvature of $$r=2(16cm)=+32cm$$

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