Question

define focal length for mirror​

Answer 1

Answer:

The distance between the convex lens or a concave mirror and the focal point of a lens or mirror is called the focal length. It is the point where parallel rays of light meet or converge. The focal length varies with the sign (positive or negative) depending upon the nature of the lens and mirror(concave or convex).

Hope it helps.

Answer 2

Answer:

the distance between the mirror and the focal point is called focal length