Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What are the components of the eye?
   • The eye consists of an: iris; pupil; cornea; lens; retina; and optic nerve.
2. How does light enter the eye?
   • Light enters the eye through the pupil.
3. Why does the pupil change size?
   • The pupil changes size to keep the amount of light Energy entering the eye constant.
4. How is a focused (clear) and bright image produced by the eye?
   • Light is refracted so that rays of light from the one place on the object reaches only one place on the retina. This creates a focused (clear) and bright image.
5. Why are the cornea and lens convex in shape?
   • The cornea and the lens are convex in shape and so focus the light.
6. What does a lens do to the image of an object?
   • A lens can be used to form a bright, focused image.
7. How do they specialised cells detect changes in light energy in the eye?
   • The retina has specialised Cells that sense / detect light Energy by having chemicals that are destroyed when they absorb the light Energy.
8. How does the eye inform the brain what you see?
   • The Cell uses the amount of chemical left to send a message to the brain in the form of electrical Energy.