and elvis said ……… ……let there be light the visible spectrum
TRANSCRIPT
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And Elvis said ……………Let there be Light
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The Visible SpectrumThe Visible Spectrum
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Prism and colors
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Light and Matter
Transparent –materials that transmit light Transparent –materials that transmit light waves. waves.
Translucent – materials that transmit light Translucent – materials that transmit light but do not permit objects to be seen clearly. but do not permit objects to be seen clearly.
Opaque – Materials that absorb or reflect all Opaque – Materials that absorb or reflect all the light waves that fall on them. the light waves that fall on them.
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Waves: Light and Color
Light provides a great variety of information. The eye can detect tiny changes in the size, brightness and color of an object.
A hand against a white wall illuminated by the colors red, blue and green would show the varieties of the colors both on the hand as well as displaying multicolored shadows on the wall.
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R REDRED O ORANGEORANGE
Y YELLOWYELLOW G GREEN GREEN
B BLUEBLUE
I INDIGO INDIGO V VIOLETVIOLET
AND ARE THE COLORS OF THE AND ARE THE COLORS OF THE SPECTRUMSPECTRUM
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PRIMARY COLORS OF LIGHT WAVES
GREEN
BLUE
RED
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Additive Process of Primary Colors
• RED AND BLUE = RED AND BLUE =
magenta
RED AND GREEN=
BLUE AND GREEN =
yellow
cyan
* magenta, yellow and cyan are secondary colors
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Complementary colors of light
•Light of a color and its Complementary Color add to produce White light.
If yellow light = red and green and yellow + blue = white then yellow is complementary to blue
Cyan and red are complementary colors
Magenta and green are complementary colors
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Newton Color Wheel
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Newton Color Wheel
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Pigments and Dyes
A dye is a molecule that absorbs certain A dye is a molecule that absorbs certain wavelengths of light and transmits or wavelengths of light and transmits or reflects others. reflects others.
A pigment is like a dye. It is colored A pigment is like a dye. It is colored material that absorbs certain colors and material that absorbs certain colors and transmits or reflects others. A pigment transmits or reflects others. A pigment particle is larger than a molecule and can be particle is larger than a molecule and can be seen with a microscope. seen with a microscope.
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Subtractive Process
The absorption of light forms colors by the The absorption of light forms colors by the subtractive process. subtractive process.
Molecules in pigments and dyes absorb Molecules in pigments and dyes absorb certain colors from white light.certain colors from white light.
A pigment that absorbs only one color A pigment that absorbs only one color from white light is called Primary Pigment.from white light is called Primary Pigment.
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Primary Colors of Pigments
yellow magenta
cyan
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SECONDARY PIGMENT COLORS
A pigment that absorbs two primary colors A pigment that absorbs two primary colors and reflects one is a secondary pigment. and reflects one is a secondary pigment.
red green blue
•Note that the primary pigment colors are the secondary light colors.
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Complementary Pigment ColorsThe primary pigment yellow absorbs blue light.
If it is mixed with the secondary pigment blue that absorbs green and red light, all light will be absorbed.
No light will be reflected, so the result will be black. Yellow and blue are called complementary pigments.
Cyan and red, as well as magenta and green, are also complementary pigments.
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Conclusion and Review
White light is a combination of the spectrum of White light is a combination of the spectrum of colors, each having a different wavelength. colors, each having a different wavelength.
Primary colors in light are red, blue and green. Primary colors in light are red, blue and green. Primary colors of pigments are yellow, cyan and Primary colors of pigments are yellow, cyan and magenta. magenta.