## Step3

Pupil

You are going to look into the eyes of a classmate again. Your classmate will look in the direction of a lightsource, like the window or near a lamp. Do not look directly into the sun. The classmate will cover one eye with a hand, but does not close the eye!

After 30 seconds remove the hand. Now look at the pupils. What do you notice? Discuss with your classmate.

Complete the text below by filling in the missing words:

dark - retina - less - contracted - big - small

When you look at the light, your pupil is ..1.. . This is because the muscles of the iris are ..2.. . This way ..3.. light will fall into the eye, onto the retina. This makes sure the ..4.. does not get damaged. In a ..5.. environment your pupil is ..6.. . Because of this you are able to still see a lot when it is dark.

1= ...

2= ...

3= ...

4= ...

5= ...

6= ...