electromagnetic waves and color physics mrs. coyle
TRANSCRIPT
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Electromagnetic Waves and Color
PhysicsMrs. Coyle
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Color
•Color is the perceptual quality of light.
• The human eye
can distinguish almost ten million colors.
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Types of Materials
Transparent Translucent
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Color comes to our eyes from objects due to:
• Emission• Reflection• Transmission• Interference• Dispersion• Scattering
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Emission: the object itself is a source of light.
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Reflection: certain
frequencies are
reflected from the object,
others are absorbed.
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A particular material absorbs the light frequency that matches the frequency at which electrons in the atoms of that material vibrate.
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• The energy of the frequency absorbed turns to heat.
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Transmission: certain frequencies are transmitted through the object, others
are absorbed.
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Scattering: the
reradiation of certain
frequencies of light, striking
small, suspended particles.
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Interference: constructive and destructive interference.
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Dispersion: the angular
separation of a light wave
during refraction.
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Why do we see the colors of the rainbow?
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Why is the sky blue?
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Why is the ocean sometimes blue, gray or
green?
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Primary Colors of Light
http://photographycourse.net/wp-content/uploads/2008/03/rgb_illumination-300x225.jpg
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Primary Colors of Light: Red, Green, Blue-combine to white
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Secondary colors of Light:cyan, magenta, and yellow-
also combine to white.
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• A complementary color is formed by subtracting a primary color from white light.
• Every secondary color is the complement of a primary color.
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If a blue and yellow flashlight strike a white object at the same time, what color will the object
appear?
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If red is subtracted from white, what color remains?
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What color will a blue ball appear if a red light only
strikes it and why?
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Color of light is an additive process with respect to
frequency. Why?
• The primary colors when added together give white light.
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Additive Color of Light Mixing Applications
• Movie film • Slide projector • Television and computer displays
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Primary Colors of Pigment(Cyan, Yellow, Magenta combine
to give Black color pigment)
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Notes
• The primary colors of pigment are the secondary colors of light and vice versa.
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When magenta and cyan pigments are mixed what
color results?
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Pigment is a subtractive color process. Why?
• Colors are formed by absorbing (taking away) certain frequencies from white light.
• The absence of a reflected light wave appears as black color.
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Applications: painting, printing, etc.