Question

Why  does  our  image  appear  thin  or  bulged?

Answer 1

our image appears thin or bulged in the type of mirror we use.
it appears so because of the bulge the mirror has

Answer 2

The type of image that is formed dependent on the reflecting surface the mirror has. If an object is placed within the focal length of a concave mirror,the mirror can produce a magnified virtual image.This property helps to use concave mirror as magnifying reflectors,for example;you can study a wound on your face close to a concave mirror and the image will look much bigger compared to a plane mirror.
Convex mirror;the images produced is virtual and smaller in size and also thinner and so they are used in all automobiles