(a) For a plane mirror, the image is as far behind the mirror as the object is in front of it i.e., the perpendicular distance of image from the mirror is equal to the perpendicular distance of object from the mirror.
Hence, the image of the insect is formed 1 m behind the mirror.
(b) The distance between the insect and it’s image = the perpendicular distance of image from the mirror + the perpendicular distance of object from the mirror
= 1 + 1
= 2 m
Hence, the distance between the insect and it’s image = 2 m
