Question

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

Answer 1

Answer:

10cm

Explanation:

f=r/2

f=20/2

f=10

Answer 2

Answer:

10cm.

Explanation:

Given,

Radius of curvature(r)=20

Focal length(f)=?

we know, radius of curvature is double the focal length of a mirror.

so,

f=r/2

f=20/2

f=10

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