Question

The radius of curvature of a spherical mirror is 20 cm what is its focal length​

Answer 1

Answer:

10 cm

Explanation:

focal length=half of radius of curvature=20cm/2=10cm

Answer 2

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Radius of curvature (R) = 20 cm

Radius of curvature of the spherical mirror = 2 × Focal length (f)

$\large\bf\red{R = 2f}$

f= R/2 = 20 / 2 = 10