Question

determine the focal length of a concave mirror which has a radius of curvature equal to 20 centimetre​

Answer 1

Answer:

The real and inverted image created by a concave mirror becomes of equal size to the object when both object and images are situated on the centre of curvature.

This means that the object distance is equal to the radius of curvature for the mirror.

Radius of curvature =2× focal length of the mirror.

Given, focal length of the mirror =15cm

So, object distance = radius of curvature =2×15cm=30cm

Hope it helps

Mark brainliest