Fill in the following blanks with suitable words :

(a) Parallel rays of light are refracted by a convex lens to a point called the ______

(b) The image in a convex lens depends upon the distance of the ____ from the lens.

The distance between the extreme points on the periphery of the mirror is called:

The maximum magnification that can be obtained with a convex lens of focal length $2.5\ cm$ is ( the least distance of distinct vision is $25\ cm$)

Which lens has magnification less than $1 ?$

A plane mirror produces an image that is