Question 2
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

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Solution

Radius of curvature, R = 20 cm
Radius of curvature of a spherical mirror = $2 \times$ focal length (f)
R = 2f
$f = \frac{R}{2} = \frac{20 c m}{2} = 10 c m$
Hence, the focal length of the given spherical mirror is 10 cm.

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Question 2 The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

Radius of curvature, R = 20 cm Radius of curvature of a spherical mirror = 2× focal length (f) R = 2f f=R2=20 cm2=10 cm Hence, the focal length of the given spherical mirror is 10 cm.

Question 2
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

Radius of curvature, R = 20 cm
Radius of curvature of a spherical mirror = $2 \times$ focal length (f)
R = 2f
$f = \frac{R}{2} = \frac{20 c m}{2} = 10 c m$
Hence, the focal length of the given spherical mirror is 10 cm.