Question

The radius of curvature of sphericalmirror is 20cm.what is its focal length.

Answer 1

focal length = 10 cm

Answer 2

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Given,

$\bf{\implies}$ Radius of $\bf{Curvature}$ = 20cm

As we know,

$\bf{\implies}$Focal length = Radius of curvature / 2

$\bf{\implies}$ Focal length = 20 / 2cm

$\bf{\implies}$ Focal length = $\bf{10cm}$

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