Concave Mirror Focal Length by u-v Method :-
Concave mirrors have the reflecting surface that bulges inward. They are also called converging mirrors because it converges all parallel beam of light incident on it. Unlike a flat mirror, concave mirrors can form real images that are projected out in front of the mirror at the place where the light focuses. Concave mirrors can be used in satellite dishes, vehicle headlights, astronomical telescopes and many more areas.
The relation between object distance u and the image v from the pole of the mirror is given by,
1/v + 1/u = 1/f
Where, f is the focal length of the mirror. The focal length of the concave mirror is obtained either from 1/v versus 1/u graph or from u–v graph.
This video explains how to find the focal length of the given concave mirror by (i) by u-v method, (ii) from u – v graph and (iii) from 1/u – 1/v graph.