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Electromagnetic Waves and Color Physics Mrs. Coyle
Color Color is the perceptual quality of light. The human eye can distinguish almost ten million colors.
Types of Materials Transparent Translucent
Color comes to our eyes from objects due to: Emission Reflection Transmission Interference Dispersion Scattering
Emission: the object itself is a source of light.
Reflection: certain frequencies are reflected from the object, others are absorbed.
A particular material absorbs the light frequency that matches the frequency at which electrons in the atoms of that material vibrate.
The energy of the frequency absorbed turns to heat.
Transmission: certain frequencies are transmitted through the object, others are absorbed.
Scattering: the reradiation of certain frequencies of light, striking small, suspended particles.
Interference: constructive and destructive interference.
Dispersion: the angular separation of a light wave during refraction.
Why do we see the colors of the rainbow?
Why is the sky blue?
Why is the ocean sometimes blue, gray or green?
Primary Colors of Light http://photographycourse.net/wp-content/uploads/2008/03/rgb_illumination-300x225.jpg
Primary Colors of Light: Red, Green, Blue-combine to white
Secondary colors of Light: cyan, magenta, and yellow- also combine to white.
A complementary color is formed by subtracting a primary color from white light. Every secondary color is the complement of a primary color.
If a blue and yellow flashlight strike a white object at the same time, what color will the object appear?
If red is subtracted from white, what color remains?
What color will a blue ball appear if a red light only strikes it and why? =>
Color of light is an additive process with respect to frequency. Why? The primary colors when added together give white light.
Additive Color of Light Mixing Applications Movie film Slide projector Television and computer displays
Primary Colors of Pigment (Cyan, Yellow, Magenta combine to give Black color pigment)
Notes The primary colors of pigment are the secondary colors of light and vice versa.
When magenta and cyan pigments are mixed what color results?
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.
Applications: painting, printing, etc.
Light (or the ELECTROMAGNETIC SPECTRUM)
Color Isaac Newton passed a beam of sunlight through a prism and this resulted in a patch of colors on a white piece of paper. He called this spread of.
EQ: How does light interact with matter?
Light and Color. Light interacting with matter When light hits matter, at least one of three things can happen: – Reflection When light bounces off an.
Visible Light and Color
CP Physics Mr. Miller. General Information Sir Isaac Newton – first to realize white light composed of different colors Prisms – separate white light.
Physical Science Light. Electromagnetic Spectrum.
ColorColor. Isaac Newton first studied light when he used a piece of glass and first saw the color spectrum.
Electromagnetic Waves and Color Physics Ms. Shaver.
Color Chapter 28.
Chapter 28 Color. Spectrum: The spread of colors seen when light is passed through a prism or diffraction gradient.
And Elvis said ……… ……Let there be Light The Visible Spectrum.
Not in things themselves Provoked by the frequencies of light emitted or reflected by things.
Color. COLOR The Color Spectrum Sun light is an example of white light. When passed through a prism, it gives the above colors. Under white light, white.
Interactions of Light Waves and Matter
Color. Color 1. SELECTIVE REFLECTION Most objects "reflect" rather than emit light. Radiations that match the resonant frequencies of the atoms are.
Light & Color What happens to the light that strikes an object? What determines the color of opaque, transparent & translucent object? How is mixing pigments.
Light and color.
Ch. 4, Sect 1 Notes Light and Color Week 8. When Light Strikes an Object When light strikes an object, the light can be ___ REFLECTED ___, ___ TRANSMITTED.
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