Question

A concave mirror has radius of curvature 20 cm. Write the focal length of the concave mirror with proper sign.

please urgent​

Answer 1

Answer:

10cm

Explanation:

The focal lenght is half of the radius of curvature in spherical mirrors

Answer 2

Answer:

10 cm

Explanation:

As we know that focal length is half of radius of curvature

f = R/2

Therefore,

f = 20/2 = +10 cm

Hope it helps....