Question

the radius of curvature of convex mirror is 20cm.find its focal length

Answer 1

r=2f
so, the focal length is 10cm
hope it helps

Answer 2

Given :

The radius of curvature of convex mirror is , r = 20 cm .

To Find :

The focal length of convex mirror .

Solution :

We know , relation between focal length and radius of curvature is given by :

$R=2f$

Here , f is focal length .

Therefore ,

$f=\dfrac{R}{2}\\\\f=\dfrac{20}{2}\ cm\\\\f=10\ cm$

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

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Mirrors and lens

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