If the radius of curvature of a concave mirror is 20 cm, then its focal length is:

10 cm

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20 cm

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40 cm

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80 cm

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Solution

The correct option is A
10 cm

$f = R / 2$

$f = 20 / 2$

$10 c m$

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If the radius of curvature of a concave mirror is 20 cm, then its focal length is:

The correct option is A 10 cm f=R/2 f=20/2 10 cm

The correct option is A
10 cm

$f = R / 2$

$f = 20 / 2$

$10 c m$