# Chapter 34 - Images - Problems: 12a

$R=72cm$

#### Work Step by Step

To find the radius of curvature, use the equation $$R=2f$$ "The distance between the focal point and the mirror" is defined as the focal length. Therefore, the focal length is $36cm$. Since the mirror is concave, the value of the focal length is positive. Substituting this value into the equation yields $$R=2(36cm)=72cm$$

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