You will need: A magnifying glass, a light source (eg. Laser or torch,) and finally you will need a ruler.
The straight black line is the ruler. In the middle of the ruler is the magnifying glass. The fire is the torch. The dotted line is the light ray. The lens refracts the light, making it slightly rise up .
There is a glass full of water, and behind it is an arrow. The arrow is actually pointing in a different direction thsn what you see it in. The light refracts , because it goes through different materials and it twists around before reaching your eye.
This experiment makes different patterns as the water refracts and