Question

prove that for any spherical mirror l/f=1/v+1/u, where the symbol have their usual meaning.​

Answer 1

Answer:

Focal length (f) of a mirror does not depend upon u or v. It cannot be changed by moving the object towards or away from the mirror. This is because, when we change object distance (u), the image distance (v) changes, keeping (f) constant. <br> Infact, focal lenght of mirror is half the radius of curvatur (R) of the mirror, i.e.,

. Focal length will change with change in radius of curvature of the mirror.