Transcript COLOR The Color Spectrum • The spread of colors from white light when passed through a prism or diffraction grating. – Red, Orange, Yellow,

COLOR
The Color Spectrum
• The spread of colors from white light when
passed through a prism or diffraction
grating.
– Red, Orange, Yellow, Green, Blue, Violet
The Color Spectrum
• 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
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?