Question

what is image formation by spherical mirror​

Answer 1

$\huge\underline\mathfrak\red{Solution}$

The diverged rays NZ and XY are extended behind the mirror, where they intersect each other at the principal focus (f). Hence, in this case, the properties of the images formed are formed at the principal focus (f) behind the mirror and are highly diminished, the images are virtual and erect.