does light let you see these words? Here’s how:
you’re looking out the window on a sunny day and you see a
tree. You see that tree because light from the sun hit that tree.
Some of that light reflected from the tree—it bounced off
the tree like a ball bouncing off a wall.
of that reflected light hit you right in the eye. That reflected
light goes through the clear cornea
of your eye. As it goes through the cornea, it bends a little.
light shines through your pupil,
the dark hole in the middle of your eye.
light shines through the lens
of your eye. The lens in your eye bends the light that has reflected
from that tree to make a perfect little upside-down picture of the
tree on the back of your eyeball. (Find out more about lenses
and how bending light makes pictures.)