How can you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them?

How can you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them?

Answer:
By observing the virtual images formed by the three mirrors, we can distinguish between the mirrors as:

  1. Plane mirror will produce an image of the same size,
  2. Concave mirror will produce a magnified image, and
  3. Convex mirror will produce a diminished image.