what I’m saying?
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
Electromagnetic Wave (EM)
Electric Field Magnetic Field
How Is Light Produced?
The vibration of an electrically charged particle!!!!
FILAMENT Radiation: emission of energy in the form of EM waves When electrical energy is supplied, the atoms in the filament vibrate back and forth
The Production Of Light Step 1 All electrons can be found in an energy level When they absorb energy…
The Production Of Light Step 2 Electrons cannot stay at these levels When they fall, they release energy…
The Production Of Light Step 3 Electrons continue to move back and forth, creating a stream of photons
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
Light Interactions 4 Interactions of Light
When light or any other waves bounces off an object Allows us to see objects that do not produce their own light
Diffuse Reflection When light waves reflect at many different angles!!
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
You See What I’m Saying? To see things, we can use lenses…but how many are there?
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
Concave Lenses As the light enters to the left, the lens bends or refracts the light outward at different angles
Bending of a wave as it passes at an angle from one medium to another
Light and Color
Color is produced by REFLECTION and ABSORPTION!!!!
The colors that are REFLECTED are the colors that you can see!!!!!!
What Are Our Basic Colors?
Meet ROY G. BIV
R O Y G B I V = RED = ORANGE = YELLOW = GREEN = BLUE = INDIGO = VIOLET