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
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!!!!
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…
They Jump To Different Levels!!

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

7. The Production Of Light
Step 3
Electrons continue to move back and forth, creating a stream of photons
This creates the Electromagnetic Wave!!

8. Speed Of Light 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

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

11. When light waves reflect at many different angles!!
Diffuse Reflection
When light waves reflect at many different angles!!
DOES NOT produce a clear image!!

12. Absorption and Scattering
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

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

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

17. Light and Color 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?
Meet ROY G. BIV
THE RAINBOW!!! R O Y G B I V
= RED
= ORANGE
= YELLOW
= GREEN
= BLUE
= INDIGO
= VIOLET