1. Lesson Objectives Explain how light travels Explain how we see objects Know how shadows are formed

2. Light Travels from a light source into our eyes or Light travels to our eyes after being reflected off an opaque object.

3. Can you spot the mistake?

4. The eye

5. Cornea – protects the pupil Iris – controls the size of the pupil Lens – bends rays of light to form a clear image Pupil – lets light into the eye Retina – where the image is formed Optic nerve – sends messages to the brain

7. Molecular Expressions Microscopy Primer: Light and Color - Human Vision: Interactive Java Tutorial

8. THE EYE The pupil allows light to enter the eye. The lens helps to focus the light Light sensitive cells in the retina detect the light. A nerve impulse travels from the retina to the brain along the optic nerve where it is interpreted. The iris helps to change the size of the pupil

9. http://cse.ssl.berkeley.edu/light/program.html

10. Are two eyes better than one? Vs.