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Light & Electromagnetic Radiation

Discover the fundamentals of light and electromagnetic radiation, including properties, colors, vision, and materials. Learn about how light interacts with objects and the different types of color mixing processes to create hues.

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Light & Electromagnetic Radiation

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  1. Light & Electromagnetic Radiation Ch. 19

  2. Electromagnetic Radiation • Electromagnetic waves are transverse waves created by the motion of electrically charged particles • Radiation is the transfer of E by electromagnetic waves

  3. Electromagnetic Radiation • Do not need a medium to transfer E • Can travel up to 300,000 km/s (light speed) • Slows down when it passes through matter (s, l, g) but still travels much faster than sound or water waves.

  4. Electromagnetic Radiation • In a vacuum: • All EM waves travel at the same speed • Frequency and wavelength vary • Remember: as frequency increases, wavelength decreases

  5. Light • Light either passes through, is absorbed by, or bounces off of an object, depending on what it’s made of: • Opaque materials • Absorb or reflect all light • Cannot see through them • Example: heavy curtains

  6. Light • Translucent Materials • Allow some light to pass through • Cannot clearly see objects through them • Examples: frosted glass, sheer curtains, waxed paper

  7. Light • Transparent Materials • Allow light to pass through • Clearly see objects through them • Example: glass windows

  8. Light • Color • Why are blue jeans blue? • Blue jeans absorb all colors except blue. The blue light is reflected back to your eyes.

  9. Light • White • Reflecting all colors – ROYGBV (red, orange, yellow, green, blue, violet) • Black • Absorbs all colors, reflects none back to your eyes

  10. Light • How do you actually see color? Night vision Rods Light Retina Cones Absorb color Detailed shapes Photoreceptor Cells

  11. Light • Cone cells – 3 types: • Red, blue, and green (primary colors of light) • Each “measures” the amount of that color of light, and they combine signals to tell your brain the color you’re seeing

  12. Color • Pigments • Absorb some colors and reflect others • Used to create materials that absorb all colors except the one we want • Color we want is reflected • Examples: dye, ink, paint

  13. Color • Filters • Transparent material that transmits one or more colors of light but absorbs all others • Color we want is let through • Color of filter is the same as the color it transmits

  14. 2 Types of Color • Additive • Primary colors – R, G, B • Adding light of different colors to create all colors • Additive because R + G + B = white • (Colors add to form white, a color that reflects all others)

  15. 2 Types of Color • Subtractive • Primary colors yellow, magenta, cyan • Adding pigments so that more color is absorbed and less is reflected • Subtractive because Y + M + C = black • (Colors combine to formblack, a color that absorbs all others)

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