LIGHT AND COLOR. LIGHT:PARTICLE Light is made of tiny “packets” called photons. The speed of...
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Transcript of LIGHT AND COLOR. LIGHT:PARTICLE Light is made of tiny “packets” called photons. The speed of...
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LIGHT AND COLOR
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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
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LIGHT:PARTICLE
The Michelson experiment Calculating the speed of light using a rotating
mirror
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LIGHT:WAVE Electromagnetic Spectrum
Radio Waves Microwaves Infrared Visible (Light) Ultraviolet X-Rays Gamma Rays
Greater Frequency
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LIGHT:WAVE
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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
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LIGHT
Light slows down when it passes through materials
Fiber Optics Critical Angle
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COLOR White Light
Combination of all visible light
“Black Light” The absence of light
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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
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