When an object is placed in front of convex mirror of focal length $20 \mathrm{cm}$ at a distance $25 \mathrm{cm}$ from the pole. What will be the shape of the image formed?

$1)$ Imaginary,erect

$2)$ Real, diminished

$3)$ Real, magnified

$4)$ Imaginary, diminished

($F =$ principal focus, $C =$centre of curvature, $P =$ pole)

Focal length of one convex mirror is $3 \mathrm{m}$ and object distance is $5 \mathrm{m}$, then find the image distance.

Where in front of a concave mirror image of an extended object placed at infinity will be formed by the mirror? Mention one feature of the image.