The three different types of mirrors can be identified by forming the images.
- Plane mirror forms an erect image which is of the same size as the object. The image formed by plane mirror cannot by obtained on a screen, i.e, it is virtual.
- Concave mirror forms both real and virtual images. The image can be smaller or larger in size than the object.
- Convex mirror always produces virtual and upright images. The size of the image is always smaller than the object.