Question

A spherical mirror has a radius of curvature of 10cm. what is the focal length of this mirror?

Answer 1

$\Large\color{darkblue}\underline{\underline{\sf Question-}}$

A spherical mirror has a radius of curvature of 10cm. what is the focal length of this mirror?

$\Large\color{darkblue}\underline{\underline{\sf Answer-}}$

Spherical Mirror are of 2 types :

1. Concave mirror.
2. Convex mirror

In spherical mirror radius of curvature is double of focal length.

i.e. $\Large\color{violet}\blacksquare\underline{\boxed{\sf R=2f}}$

Here ,

Radius of Curvature is = 10cm

⛬ $\implies{\sf R =2f}$

$\implies{\sf f =\dfrac{10}{2}}$

$\color{red}\implies{\sf f = 5cm }$

$\Large\color{darkblue}\underline{\underline{\sf Answer-}}$

Focal length of this mirror is $\color{red}{\sf 5cm}$.

Answer 2

Answer:

5cm

Explanation:

The radius of curvature of any spherical mirror is twice the focal length.

R = 2f

10 = 2f

f = 5cm

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