Question

The focal length of a
spherical mirror is 4.5 cm.What
is the radius of curvature?​

Answer 1

Answer:

Radius of Curvature is 9cm

Explanation:

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

∴ $f=4.5 cm$

∴ $R=4.5*2 =9cm$

Answer 2

Focal length of a plane mirror is infinity. (A plane mirror can be considered as a spherical mirror of infinite radius of curvature. Focal length is half of radius of curvature and hence it is infinity.