The Color Spectrum • The spread of colors from white light when passed through a prism or diffraction grating. • Red, Orange, Yellow, Green, Blue, Violet
TheColorSpectrum • White Light: Light, such as sunlight, that is a combination of all the colors.
The Color Spectrum • Quick Experiment (5 min.): • Go to the lab stations (4 per station) • Use the white paper, light source and prism to create the color spectrum.
Color by Reflection • The colors of most objects are due to the way the objects absorb and reflect light. • If it looks red under white light, the object absorbs most of the frequencies of light and reflects red. • Most materials absorb light of some frequencies and reflect the rest. • If it reflects all of the visible frequencies, then the color is white. • If it absorbs all the visible frequencies, then the color is black.
Mixing Colored Light • Almost every color can be made by overlapping light of three colors and adjusting the brightness of each color. • Additive Primary Colors: Red, Green and Blue (light). These produce the highest number of different colors. When added together, they produce white.
Mixing Colored Light • What happens when two of the three additive primary colors are combined? • Red + Green = • Red + Blue = • Blue + Green =
Mixing Colored Light • What happens when two of the three additive primary colors are combined? • += Yellow • += Magenta • += Cyan
Complementary Colors • When two colors are added together to produce white, they are called complementary colors. • We know that: Blue+Green+Red=White
Complementary Colors • We know that: Blue + Green + Red = White • So, • Cyan + Red = White • Cyan and Red are COMPLEMENTARY COLORS
Complementary Colors • What is the complementary color of blue? • What is the complementary color of green?