At the eye doctor, Raven looks at a big model of an eye. It splits open like a puzzle.
"Look, there is a lens inside," she says. "Just like a camera."
Rocket points to the back of the model. "And a cable runs out the back. Where does it go?"
"What do you notice about the order of the parts?" Raven asks.
Nova traces a glowing path through the model. "My hint," she says. "Follow the light from the front to the back. Then keep going."
Seeing starts when reflected light reaches your eye.
First, light passes through the cornea, the clear front layer of the eye.
Next, light enters through the pupil, an opening in the middle of the eye.
Then light passes through the lens, a clear part inside the eye.
At the back is the retina. Special cells there turn light into electrical signals.
The signals travel through the optic nerve to the brain. Your brain turns them into the pictures you see.
Your eye works like a team. Each part has a job.
The cornea and lens are clear, so light can pass through them.
The pupil lets light in. The retina turns light into signals.
The optic nerve carries signals to the brain, and the brain makes the picture.
| Statement | True or false? |
|---|---|
| The retina is at the back of the eye. | ? |
| The lens is a clear part inside the eye. | ? |
| Light reaches the retina before the cornea. | ? |
| It is safe to look at the Sun with sunglasses. | ? |
You followed light all the way to your brain! Tomorrow at Launch Lab, your family runs a mirror relay.