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Interactions of Light Waves

Interactions of Light Waves. S8P4 b. Do you remember the 4 ways waves can interact with a medium?. Reflection Refraction Diffraction Absorption. The Law of Reflection. When light waves bounce off an object Mirror First light is reflected off of you

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Interactions of Light Waves

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  1. Interactions of Light Waves S8P4 b

  2. Do you remember the 4 ways waves can interact with a medium? • Reflection • Refraction • Diffraction • Absorption

  3. The Law of Reflection • When light waves bounce off an object • Mirror • First light is reflected off of you • Second the light is reflecting off the mirror • The law of reflection states that the angle of incidence is equal to the angle of reflection

  4. Types of Reflection • Regular Reflection-smooth surface where light reflects off all points • Diffuse Reflection-rough surface where the light reflects in different angles

  5. Absorption • The light of a flashlight is weaker because the beam spreads out and because of absorption and scattering • Absorption is the transferring of energy by light waves to particles of matter • The more it is absorbed the dimmer it gets

  6. Scattering • Scattering is an interaction of light with matter that causes light to change direction. • Allows you to see things outside of the beam, but dimmer • Helps make our sky look blue

  7. Refraction • Refraction is the bending of a wave as it passes at an angle from one substance to another • Speed of Light • Optical Illusion-when light does not travel in a straight line (water)

  8. 1) Is This Possible??

  9. Are the purple lines straight or bent?

  10. Do you see gray areas in between the squares? Now where did they come from?

  11. Color Separation • White light is composed of all wavelengths of visible light • Wavelength determines color! • Waves with short WL bend more than waves with long WL • Color separation by refraction is responsible for the formation of the rainbow (refract by water droplets)

  12. Colors • Primary Colors (we see)- red, blue, and green • Pigment- a material that gives a substance its color by absorbing some colors of light and reflecting others • Primary Pigments- cyan (blue), magenta (pink-red), and yellow

  13. Diffraction • Diffraction is the bending of waves around barriers or through openings • Depends on WL and size of opening • Shadows are blurry around the edges

  14. Light and Matter • Transmission is the passing of light through matter • Reflected • Absorbed • Window • See objects outside (transmitted) • See the glass and reflection (reflection) • Glass feels warm (absorbed)

  15. Types of Matter • Transparent- matter through which visible light is easily transmitted (clear glass) • Translucent- matter transmit light but also scatters the light as it passes through the matter (wax paper) • Opaque- matter that does not transmit any light (wood)

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