Question

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

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Answer 1

Answer:

10 cm

Explanation:

Given,

Radius ( R ) = 20 cm

To find : Focal length ( f ) = ?

Formula : -

R = 2f

20 = 2f

f = 20 / 2

f = 10 cm

Therefore, its focal length is 10 cm.

Answer 2

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