The visible waves in the electromagnetic spectrum

Each color has a different wavelength and frequency.

Substances either reflect or absorb different wavelengths.

The color of an object is the color of light it reflects.

All colors reflected make “white”. All colors absorbed make “black”.

If light hits a red tulip, allcolors are absorbed except red.Red is reflected.As it hits the leaf, all colors areabsorbed except green. Green is reflected.What happens when lighthits a skunk?

Dark & Light Dark colors absorb

light and heat Light colors reflect

light and heat Think about choosing

towear dark or light colorsthe summer Which pug stays

cooler in the summer, Zeus or Zoey?

Red has the longest wavelength and shortest frequency.

Violet has the shortest wavelength and highest frequency.

When listing colors, order is important.Colors & wavelengths:

red 620–750 nm (a nanometer=10-9)orange 590–620 nmyellow 570–590 nmgreen 495–570 nmblue 450–495 nmviolet 380–450 nm

A rainbow is an event in nature when the spectrum of light appears in the sky as the sun shines on droplets of water.

What do you see about the order of colors in a rainbow?

Why do you think this happens?

Look at this doublerainbow.

Traditional color theory—less accepted today.

All pigment colors can be mixed by combining primary colors of Red, Yellow, & Blue (RYB).

Subtractive—used in mixing pigments.All colors can be mixed to absorb

different wavelengths of color using primary pigment colors of Cyan, Magenta, Yellow, & Black (CMYB).

Additive—mixing colors of light.All colors of light can be produced by

mixing primary light colors: Green, Red, & Blue (GRB).

Some animals perceive different wavelengths than humans.

http://www.eyes-and-vision.com/how-animals-see-the-world.html