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Color and Polarization

Color and Polarization. Learning Targets:. I can apply an understanding of color to the visible spectrum of light I can list primary, secondary, and complementary colors and describe how they are created I can compare and contrast the colors black and white and describe how they are created

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Color and Polarization

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  1. Color and Polarization

  2. Learning Targets: • I can apply an understanding of color to the visible spectrum of light • I can list primary, secondary, and complementary colors and describe how they are created • I can compare and contrast the colors black and white and describe how they are created • Explain the results of polarization

  3. What are the colors of the rainbow?

  4. How are they similar? How are they different? • Although all colors are part of the visible spectrum and travel at the same speed, they each have a different frequency

  5. How do we see different colors? • The color of an object is not within the object itself but in the light which shines upon it • When light hits an object, some wavelengths are absorbed and some are reflected • Let’s see it!

  6. The wavelength reflected to our eye is what color we see the object as

  7. What about black & white? • White - Reflects all colors • Black – Absorbs all colors

  8. Take out your Glow Stick Lab! • Red, green, and blue are the primary colors of light. • When all mixed together in equal amounts, the primary colors of light combine to make the color… • WHITE!

  9. Magenta, yellow, and cyan are the secondary colors of light. They are created by mixing two of the primary colors of light. • red and blue make… • MAGENTA • red and green make… • YELLOW • blue and green make… • CYAN

  10. Let’s see it! • Two colors of light that produce white light when added together are called complementary. • Complementary colors of light consist of one primary color and one secondary color. • MAGENTA (R+B) and GREEN = White • CYAN (G+B) and RED = White • YELLOW (G+R) and BLUE = White

  11. How do you get all the other colors? • Vary the intensity of red, green, and blue light!

  12. Paint vs. Light • Why are mixing red, blue, and green paints different than mixing red, blue, and green light? • LIGHT REFLECTS LIGHT (additive color mixing – make white) • PAINTS/PIGMENTS ABSORB LIGHT (subtractive color mixing – make black)

  13. Lies? • Then why did your third grade art teacher teach you that the primary colors are red, yellow, and blue!?! • CHEMICALLY, IT’S DIFFICULT TO MAKE CYAN AND MAGENTA PAINT • SO MOST PIGMENTS JUST COME IN RED AND BLUE INSTEAD!

  14. How does this apply to those colored glasses?

  15. Polarization of Light • Due to the unique transverse nature of a light wave, it can be thought of as a transverse wave vibrating in many directions at once if it is unpolarized.

  16. A polaroid filter allows us to let only one direction of light through!

  17. Real World Uses • Polarized sunglasses • 3D movies

  18. Do you need to print out this PowerPoint? • Go through the following questions with your lab partner • List the primary colors • List the secondary colors (and how they’re each created) • List the complementary colors (and what they combine to form) • What’s the difference between white and black? - Explain polarization

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