Reflection of Light — Question 2

Focal length = $\dfrac{1}{2}$ x Radius of curvature

Given,

f = 10 cm

Substituting the values in the formula above we get,

$10 = \dfrac{1}{2} \times \text{radius of curvature} \\[0.5em] \Rightarrow \text{radius of curvature} = 20 \text{ cm}$

Hence, radius of curvature of concave mirror = 20 cm.