Color Notes

1 / 13

# Color Notes - PowerPoint PPT Presentation

CP Physics Mr. Miller. Color Notes. General Information. Sir Isaac Newton – first to realize white light composed of different colors Prisms – separate white light into colors of light making up the visible light spectrum Each color has its own wavelength and frequency

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Color Notes' - verna

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
CP Physics

Mr. Miller

### Color Notes

General Information
• Sir Isaac Newton – first to realize white light composed of different colors
• Prisms – separate white light into colors of light making up the visible light spectrum
• Each color has its own wavelength and frequency
• Higher frequency = greater energy
• Red light – lowest frequency so least energy
• Violet light – highest frequency so most energy
Seeing Colors
• Color is the property of light reaching the eye
• Objects absorb some colors and reflect others
• We see the reflected colors!!
Color Rule #1
• The color of an opaque object depends on the frequency of light it reflects.
• All colors reflected and none absorbed = white
• No colors reflected and all absorbed = black
Color Rule #2
• Color of an opaque object depends on the color of light shown on it.
• Red object - reflects red light
• Shine white light on it – looks red
• Shine red light on it – looks red
• Shine green light on it – look black
Color Rule #3
• Color of a transparent object depend on the color of light it transmits.
• Blue filter transmits only blue light through it.
• Shine white light on it – blue passes through.
• Shine blue light on it – blue passes through.
• Shine red light on it – no light passes through.
Visible Spectrum
• ROY G BIV – red, orange, yellow, green, blue, indigo, violet
• Polychromatic = many frequencies of light colors together
• Monochromatic = single frequency of light
Primary Colors of Light
• Red, Blue, Green
• When added together they produce white light
Secondary colors of light
• Magenta, Cyan, Yellow
• Produced when two primary colors added:
• Red + Blue = Magenta
• Blue + Green = Cyan
• Green + Red = Yellow
Complementary Light Colors
• A primary light color and a secondary light color that will produce white light when added together
• Complements:
• Red + Cyan
• Green + Magenta
• Blue + Yellow
Primary Pigments
• Pigments = chemicals which absorb certain frequencies of light and reflect others
• Primary pigments absorb one primary color of light and reflect two primary colors
• Magenta – absorbs green, reflects red and blue
• Cyan – absorbs red, reflects green and blue
• Yellow – absorbs blue, reflects red and green
• So a primary pigment absorbs its complement!
Secondary Pigments
• Absorb two primary pigments and reflect one primary pigment
• Red, Blue, Green
Light colors vs. Pigments
• Primary colors of light = secondary pigments
• Secondary colors of light = primary pigments
• Mixing colors of light = ADDITIVE process
• More colors added – color of light gets lighter
• Mixing pigments = SUBTRACTIVE process
• Pigments absorb color, so more pigments absorb more colors of light and less reflected for us to see, gets darker