Question

If the radius of curvature of a convex mirror is 36 cm, what is its focal length?

Answer 1

Step-1

Given data:

Radius of curvature, $R=36cm$

Step-2

Finding the focal length:

Twice of focal length is considered as the radius of curvature, which means;

$$\begin{gathered} R=2f \\ f=\frac{R}{2} \\ f=\frac{36}{2} \\ f=18cm \end{gathered}$$

Hence, the focal length of a convex mirror is $18cm$.