Question

what is principal focus for concave and convex mirrors

Answer 1

Hi

●For a concave mirror :-The rays traveling parallel to the principal axis of a mirror after reflection pass through (converge at) a point F This point F is known as the principal focus of the concave mirror. It is a real point in front of a mirror.
●For a convex mirror :- The rays traveling parallel to the principal axis of a mirror after reflection appear to diverge from a point F on the principal axis. This point F is known as the principal focus of the convex mirror. It is a virtual point, i.e., behind the mirror.

♡I hope it helped u♡

Answer 2

incident which are parallel to the principal axis of a concave mirror , after reflection from the mirror,meet at a particular point in front of the mirror . this point (F) is called principal focus of the concave mirror.otherwise , in case of convex mirror incident which are parallel to the principal axis ,after reflection ,meet at a particular behind the mirror lying along the principal axis .This point is called the principal focus of the convex mirror.