Question

The radius of curvature of a spherical mirror is 20 cm. What is its focal length?​

Answer 1

Given,

Radius of curvature, R = 20 cm

We know that f = R/2

So, f = 20/2

= 10 cm

Hence, the focal length of mirror is 10 cm.

Answer 2

$<b>Radius of curvature of a spherical mirror = 2 × Focal length</b>$

$R= 2f \\ \\ 20= 2f \\ \\ f = \frac{20}{2} \\ \\ f = 10$

$<b> Hence, the focal length of the given spherical mirror is 10 cm </b>$





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