1. Look at your reflection on the inside of
the spoon.
The surface on the inside of a spoon bends
in like a cave - it is concave.
Dentist use concave mirrors to examine your teeth.
These mirrors make your teeth look bigger so the dentist can
examine them more easily. Likewise, shaving mirrors are concave
because they make the face look bigger.
2. Now turn your spoon out and look at your
reflection on the outside of the spoon.
The surface on the outside of a spoon bends out - it
is convex.
The next time you are at a funfair take a look at yourself
in the crazy mirrors. They bend in all sorts of ways so that
you look bigger, smaller, fatter, thinner and even wavy.