Question

The radius of curvature of a spherical mirror is 20 cm . what is it's focal
​

Answer 1

Explanation:

Radius of curvature = 2 x focal length.

So, focal length =

2

1

× radius of curvature =

2

1

×20 cm = 10 cm

Answer 2

Explanation:

if radius of curvature is 20cm

then focal length =20/2=10cm

because focal length is half of radius

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