1. Light, Mirrors, and Lenses O 4.3 Refraction and Lenses

3. Refraction and Lenses  Matter slows down light waves.  The greater the density of matter, the slower the wave will travel.  Speed of light is 300 million m/s  The larger the change in speed the more the wave will refract.

5. Refraction and Lenses  Lens – transparent object with a curved surface that bends light  Convex lens – thicker in the center than at the ends. ()  Concave lens – thicker at the ends than at the center )(

6. Convex lens magnifies Concave lens demagnifies

7. Refraction and Lenses  Concave and convex lenses act oppositely from mirrors  Convex lenses create a focal point  Concave lenses diverge light waves

10. Farsighted Eyes Near Sighted Eyes