Materials Required:
- 10 sheets of typing paper
- Rubber band
- A book
- Mirror
Procedure:
- Roll the 10 sheets of typing paper into a hollow tube. Slip a rubber band over the roll to hold it in place.
- Hold the paper tube against some words on the page of a book and look into the tube. Your face should be pressed against the tube so that no light may enter. At first, you will not be able to see much. However, your eye will soon adjust to the dark and allow you to read the words.
- Lean your head and immediately look at your eye in the mirror. Do you see any changes?
This is what happens:
The part of your eye into which light enters is called the pupil–the dark spot in
the centre of your eye. The pupil gets bigger in the dark because it must allow more light in to help you see better. When the light is too bright, the pupil tries to shut some of it out by becoming smaller.
