Question

the focal length of the concave mirrors is 15 cm calculate its radius of curvature​

Answer 1

Explanation:

Given, f = 15 cm

We know

for a mirror, R = 2f

R=2×15cm

R=30cm

Answer 2

Answer:

The focal length of the concave mirrors is 15 cm, its radius of curvature​ is $30\ cm$

Explanation:

• The distance from the pole to the center of curvature of the mirror is called the radius of curvature and focal length is the distance between the pole of the mirror and the focus of the object.

• Let R be the radius of curvature and f be the focal length then,

       $R = 2f$    ...(1)

• That is, for spherical mirrors having a small aperture, the radius of curvature is twice the focal length.

In the question, it is given that,

$R = 15\ cm = 15\times 10^{-2} m$

Substitute  the value of 'f' into equation(1),

$R = 2\times 15\times 10^{-2} =30\times10^{-2} \ m = 30\ cm$