1. Place the blu tack in
the middle of the coin.
2. Position the blu tacked
coin in the center of your pot so
that it is secured down (will not
move when you pour water into the
pot). Put some water in a
cup to pour into your bowl.
3. Move backwards away from
the bowl until you cannot see the
coin in the bowl.
4. Very slowly pour some water
into the bowl until the coin starts
to appear before your eyes.
5. Pour a bit more water,
very slowly, and continue watching
as the coin reveals itself.
Watch the bowl from where you are
Step 2 Step
What do you see?
When the bowl is empty
the edge of the bowl stops you seeing
When the bowl is full
the light bends over the edge so
you can see the coin.
Have you ever noticed
that things at the bottom of a pool
or river always look closer to the
surface than they really are?
This is because
of the way light is bent through
water and is an effect of refracted