different frequencies of “visible light”

What is it?What is it?

Different frequencies of “visible light”Different frequencies of “visible light”

Mystery ShadowsMystery Shadows

Color Mixing with Light (Color Addition)Color Mixing with Light (Color Addition)

REDRED BLUEBLUE

GREENGREEN

B + GB + GR + GR + G

R + BR + B

R + B + GR + B + G

CyanCyanYellowYellow

MagentaMagenta

WhiteWhite

RedRed and and BlueBlue are polarized are polarized verticallyvertically, , and and GreenGreen is polarized is polarized horizontallyhorizontally..

Orientation of LightOrientation of Light

We will represent light by simply looking We will represent light by simply looking at the electric field… even though the at the electric field… even though the

magnetic field is still presentmagnetic field is still present

Vertical OrientationVertical Orientation

Horizontal OrientationHorizontal Orientation

PolarizationPolarization

Polarized Light Polarized Light ≡ Light that is ≡ Light that is of all the SAME orientationof all the SAME orientation

http://www.computer-music.com/images/bryce/Don061%20Fence%20Picket%20White%20(posed).jpg

Polarizing FiltersPolarizing Filters

Which direction should this fisherman’s Which direction should this fisherman’s glasses be polarized to see fish better?glasses be polarized to see fish better?

http://www.flyfishusa.com/newsletter/060103/

http://www.mosquitocreekoutdoors.com/cgi-bin/SoftCart.exe/valorium.html?E+scstore

AABB

CC DD

http://www.exo.net/~pauld/summer_institute/summer_day6color/color_shadow_2.gif

BlueBlueGreenGreenRedRedWhat color What color

is each is each light can light can

producing?producing?

AABB CC

DRAW IT!!!DRAW IT!!!

What Temperature What Temperature do these seem?do these seem?

http://www.gelighting.com/na/home_lighting/products/reveal_tour/redecorating_tips.pdf

So, objects appear the color they So, objects appear the color they are because…are because…

The objects only reflect particular The objects only reflect particular frequencies (colors) of lightfrequencies (colors) of light

WHITE

RED

GREEN

BLUE

CYAN

MAGENTA

YELLOW

Refle

cts

Refle

cts

Gre

enGr

een

// Blu

eBl

ue

Abso

rbs

Abso

rbs R

EDRED Reflects

Reflects

BlueBlue // Red

Red

Absorbs

Absorbs GREENGREEN

ReflectsReflectsGreenGreen // RedRed

AbsorbsAbsorbs BLUEBLUE

Color Mixing with Pigment (Color Subtraction)Color Mixing with Pigment (Color Subtraction)

What colors What colors would appear would appear when mixed?when mixed?

Color Color SUBTRACTION SUBTRACTION

(pigments)(pigments)

ColorColorADDITIONADDITION

(light)(light)

RGBRGB CMYKCMYK

http://micro.magnet.fsu.edu/primer/java/primarycolors/colorseparation/

http://h0060089ab5de.ne.client2.attbi.com/wallpaper/Pics/Penguins%20on%20a%20Cold%20Perch.JPG