Question

what is meant by (1)principal focus of aconvex mirror and (2)focal lenghth of a convex mirror ​

Answer 1

Answer:

convex mirror

Explanation:

pricipal of convex mirror : the line which is passing through the pole of mirror is called principal axis

focus: the point from the pole of the mirror between centre of curvature is called focus.

focal length : the length from pole of the mirror to focus is called focal length

Answer 2

$\boxed{ \blue{ \huge{ \bold{ \underline{Answer \: : }}}}}$

For a convex mirror, we can define principle focus to be that point on the principle axis such that any paraxial rays originating from sources ( from infinity) shall meet at that point after getting reflected from the convex mirror.

For the convex mirror the principal focus is located in a virtual position inside it or behind the mirror

Focal length of a convex mirror is defined as the length on the principal axis in between the principal focus and and the pole of the convex mirror.

Focallength of a convex mirror can also be defined as the length on the principal axis in between the centre of curvature of the mirror and the principal focus of that mirror.