1. Light See what I’m saying?

2. What Is Light? Electromagnetic Wave (EM): a wave that travels through matter or space and consists of electric and magnetic fields Electromagnetic Wave (EM): a wave that travels through matter or space and consists of electric and magnetic fields Field: area around an object that can exert a force, push, or pull on another object No contact is needed

3. Electromagnetic Wave (EM) Electric Field Magnetic Field

4. How Is Light Produced? The vibration of an electrically charged particle!!!! The vibration of an electrically charged particle!!!! Radiation: emission of energy in the form of EM waves FILAMENT When electrical energy is supplied, the atoms in the filament vibrate back and forth

5. The Production Of Light Step 1 All electrons can be found in an energy level When they absorb energy…

6. The Production Of Light Electrons cannot stay at these levels When they fall, they release energy… Step 2

7. The Production Of Light Step 3 Electrons continue to move back and forth, creating a stream of photons

8. Speed Of Light In a vacuum…300,000,000 m/s In a vacuum…300,000,000 m/s However, light travels slower in air, glass, and other types of matter 1.27 Seconds 382,000,000 m

9. Light Interactions 4 Interactions of Light Light ReflectionScattering Absorption Refraction

10. Reflection Allows us to see objects that do not produce their own light When light or any other waves bounces off an object When light or any other waves bounces off an object

11. Diffuse Reflection When light waves reflect at many different angles!!

12. Absorption and Scattering Absorption: the transfer of energy carried by light waves to particles of matter Absorption: the transfer of energy carried by light waves to particles of matter Scattering: the release of light energy by particles of matter that have absorbed energy Scattering: the release of light energy by particles of matter that have absorbed energy

13. You See What I’m Saying? To see things, we can use lenses…but how many are there?

14. Convex Lenses As the light enters to the left, the lens bends or refracts the light to a single “focal point” where all the light meets at once

15. Concave Lenses As the light enters to the left, the lens bends or refracts the light outward at different angles

16. Refraction Bending of a wave as it passes at an angle from one medium to another Bending of a wave as it passes at an angle from one medium to another

17. Light and Color Color is produced by REFLECTION and ABSORPTION!!!! Color is produced by REFLECTION and ABSORPTION!!!! The colors that are REFLECTED are the colors that you can see!!!!!!

18. What Are Our Basic Colors? THE RAINBOW!!! THE RAINBOW!!! Meet ROY G. BIV ROYGBIV = RED = ORANGE = YELLOW = GREEN = BLUE = INDIGO = VIOLET