Question

the radius of curvature of spherical mirror is 20 cm. what is its focal length?​

Answer 1

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Answer 2

Answer:

Given :

• The radius of curvature of spherical mirror is 20 cm.

To Find :-

• What is the focal length of spherical mirror.

Solution :-

Given :

• Radius of curvature = 20 cm

As we know that :

$\footnotesize\bigstar\: \: \sf\boxed{\bold{\pink{Radius\: of\: Curvature_{(Spherical\: Mirror)} =\: 2 \times Focal\: Length}}}\: \: \bigstar$

According to the question by using the formula we get,

$\implies \sf R =\: 2f$

where,

• Radius of curvature (R) = 20 cm

$\implies \sf 20 =\: 2f$

$\implies \sf \dfrac{\cancel{20}}{\cancel{2}} =\: f$

$\implies \sf \dfrac{10}{1} =\: f$

$\implies \sf 10 =\: f$

$\implies \sf\bold{\red{f =\: 10\: cm}}$

$\therefore$ The focal length of a spherical mirror is 10 cm .