What does a refracted image look like?

A Refracted image is like an illusion. Which fools the brain e.g. You see a pencil but the pencil has split in two parts.

Demonstration:

You will need: Glass, Pen or Pencil and Water

Steps:

1. Put the glass on a table,

2. Fill the glass to about 3/4 quarters of water,

3. Put the Pen or Pencil in the glass of water,

4. See what happens to the pencil.

See, it seems to have split.