Question

the radius of curvature of spherical mirror is 25 cm. what is its focal length?​

Answer 1

Answer:

r=2f

25=2f

25/2=f

12.5=f

Answer 2

The focal length of the spherical mirror is 12.5 cm

Given :

The radius of curvature of spherical mirror is 25 cm

To find :

The focal length of the spherical mirror

Concept :

For a spherical mirror the focal length is equal to half of its radius of curvature

Solution :

Step 1 of 2 :

Write down the radius of curvature of spherical mirror

Here it is given that radius of curvature of the spherical mirror is 25 cm

Step 2 of 2 :

Calculate focal length of the spherical mirror

We know that for a spherical mirror the focal length is equal to half of its radius of curvature

∴ The focal length of the spherical mirror

$\displaystyle \sf{ = \frac{Radius \: of \: Curvature }{2} }$

$\displaystyle \sf{ = \frac{25}{2} \: \: cm }$

$\displaystyle \sf{ = 12.5 \: \: cm }$

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