Question

26) Radius of curvature of a mirror is 20cm, its focal length is

a. 4m

b. 40m

c. 0.25m

d. 10m
$x3$
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Answer 1

Answer:

it should be d. 10cm, the units are either wrong or the options are wrong because in m it will be 0.1m

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Answer 2

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

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Therefore, the focal length of the spherical mirror is 10 cm.