Post on 17-Jan-2016
LIGHT AND COLOR
LIGHT:PARTICLE Light is made of tiny
“packets” called photons. The speed of light (in
vacuum) is 300,000 km/s! The circumference of the
earth is about 40,075 km In one second, a light
beam can travel about 7.5 times around the earth
LIGHT:PARTICLE
The Michelson experiment Calculating the speed of light using a rotating
mirror
LIGHT:WAVE Electromagnetic Spectrum
Radio Waves Microwaves Infrared Visible (Light) Ultraviolet X-Rays Gamma Rays
Greater Frequency
LIGHT:WAVE
LIGHT:WAVE Radio waves
Low frequency, hard to disrupt
Microwaves Rotate water molecules
Infrared Heat
Ultraviolet Sunburn
X-Rays Penetrate skin
Gamma Rays Strongest energy in Universe
LIGHT
Light slows down when it passes through materials
Fiber Optics Critical Angle
COLOR White Light
Combination of all visible light
“Black Light” The absence of light
COLOR
The color you see from an object is the color it reflects (doesn’t absorb)
What you see depends on what light reaches your eye