Eyes. Test yourself

What does the pupil do in the dark? Get wider, get narrower or disappear?

Which part of the eye gathers light like a magnifying glass?

Who turns the picture from the eye over?

Why is there a blind spot in the eye? Because the nerve leaves there, because it's dark there, or because there's a tear there?

How many kinds of cones are in the eye? 1, 3 or 10?