Question

The radius of curvature of a concave mirror is 36cm. Find it's focal length.

16 cm

18 cm

63 cm

72 cm

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Answer 1

$Radius\: of \:Curvature=2 × focal\: lenght$

$Focal \:length=\frac{Radius\: of \:Curvature}{2}$

$Focal\: lenght=\frac{36}{2}$

$Focal\: length=18cm$

$Option\:B)-18cm$

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Answer 2

Focal lenght is 18cm

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