How can you distinguish between, plane mirror, convex mirror and concave mirror by merely looking at the image formed in each case?
To distinguish between a plane mirror, a convex mirror and a concave mirror the given mirror is held near the face and the image is seen.
If the image is upright, of same size as the object and it does not change in size when the mirror is moved, then the mirror is a plane mirror.
If the image is upright, magnified and it becomes inverted when the mirror is moved away from the face, then the mirror is a concave mirror.
If the image is upright and diminished and it remains upright when the mirror is moved away from the face, then the mirror is a convex mirror.