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Electromagnetic Waves Ch 13 & 14

Behavior and concepts of light

David James

on 29 April 2010

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Transcript of Electromagnetic Waves Ch 13 & 14

Electromagnetic Waves And the behavior and concepts of visible light
Parts of Ch 13 & 14
Light is an Electromagnetic “Transverse” Wave
Speed of light (or any EM Wave) in a vacuum: c = 3 x 10^8 m/s or 186,000 miles/second
Visible light is just one of many examples of EM Radiation
Visible light wavelengths: 400nm – 750nm
The sun emits Visible light along with Infrared and Ultraviolet light

c = wavelength x frequency
Sun Light The molecules in our skin “resonate” at infrared frequencies, so it is these that are preferentially absorbed and heat us up
Polarization Most light (sun, light bulbs) vibrates in many planes at once, this is said to be unpolarized light
Light that vibrates in one plane only is said to be polarized light or plane-polarized light
Polarized light can be made by sending unpolarized light through a polaroid sheet
Reflection Specular (reflection from shiny surface)

Diffuse (reflection from non-shiny surface)
Refraction Refraction: When a wave traveling in one medium crosses into another medium where the vwave is different, the transmitted wave will travel at a new angle relative to incident wave
Snell's Law n=c/v
c = speed of light in vacuum
v = speed of light in medium Total Internal Reflection Dispersion the process of separating polychromatic light (light made of more than one color) into its component wavelengths
Rainbows: a result of reflection, refration and dispersion Scattering of Light Red Sunsets, Blue Sky and White Clouds Clouds are white because they efficiently scatter sunlight of all wavelengths Light being absorbed and then re-radiated in a variety of directions Milk too (it's the fat globules) Dilute milk enough and it will begin to appear blue Colors White light can be broken into ROYGBiV

Red, Orange, Yellow, Green, Blue, “indigo”, and Violet
Color Mixing by Subtraction (pigment mixing) Color mixing by addition (light mixing) By addition: Adding the primary colored lights together at different levels in order to make all colors.

Primary Colors: Red, Green, Blue By Subtraction: Using pigments to remove colors from the incident light and relying on the reflected light in order to give color

Primary Colors: Cyan, Magenta, Yellow
When mixing by addition, a primary color has a compliment. That color is the color that makes white when mixed.

Complimentary colors: Cyan , Magenta, Yellow
When mixing by subtraction, a primary color has a compliment. That color is the color that makes black when mixed.

Complimentary colors: Red, Green, Blue
Reading and Homework Ch 13
Read pp 446 – 454, 469 – 474

Ch 14
Read pp 488 – 493, 506 – 513
Ch 13 – Due Test Day
p 449 1, 3, 5;
p 450 2 – 4;
p 454 1, 2, 5, ;
p 474 1 – 4;
p 478 37, 38, 40, 41
Ch 14 – Due Test Day
p 493 1 – 3 & 1 – 3;
p 508 1 – 3;
p 511 1, 4
Full transcript