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Understanding Light- Notes

Understanding Light- Notes. Lightning bolt will indicate pages to be written. Let’s review some wave behaviors…. I need 4 volunteers. Reflection -bouncing back of a wave when it meets a surface or a boundary.

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Understanding Light- Notes

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  1. Understanding Light- Notes Lightning bolt will indicate pages to be written.

  2. Let’s review some wave behaviors….I need 4 volunteers

  3. Reflection-bouncing back of a wave when it meets a surface or a boundary. Refraction- bending of waves due to a change in speed as they enter a new medium. (makes an “optical illusion”) Transmission- waves are able to pass through a medium. Absorption- wave energy is not transferred through a medium (it is stopped)

  4. How do these wave behaviors relate directly to light?

  5. Reflection of light: Mirrors and smooth objects reflect light to form clear images.

  6. Refraction of light: When light waves bend they separate into the ROY G BIV colors. Prisms, Diffraction Gratings, and Spectroscopes are tools used to refract light.

  7. Transmission of light: Name 1 transparent and 1 translucent object you have come in contact with today. Light waves pass through space or a medium. Materials that can transmit light are either transparent or translucent. Transparent- clear material that allows light to pass easily. The image is not distorted. Translucent- material that appears “hazy” or “foggy”. The image is distorted.

  8. Absorption of light: Name 1 opaque object in this classroom. When objects absorb light they become warmer because the energy is not “passed” on. Materials that cannot transmit light are opaque. Opaque- material that transmits no light.

  9. How do we perceive objects as having color?

  10. What color are these objects? 1. 2. yellow Why do you see yellow or black? Isn't white light shining on these objects? black RO__ G BIV is absorbed Yellow is reflected back to our eye

  11. How do we perceive objects as having color? The wavelength of light reflected off an object will be the color we see. Ex: A red apple….reflects red light Absorbs _OY G BIV

  12. What about that black cat? ROY G BIV is absorbed (all light) No light is reflected back to our eye

  13. Black objects:absorb all wavelengths of light (ROY G BIV) White objects:reflect all wavelengths of light (ROY G BIV)

  14. Pair read in small book on desk pg 120-122

  15. Now, let’s see what you have learned!!!!

  16. Part B- Use the flashlight to help you observe the following objects: • Ruler • Petri Dish • Cardboard • Straw • Plastic Square • Waxed Paper Behaviors of Light Waves Activity • Part C- Use the following objects: • Egg • Comb • Paper • Styrofoam ball • Test tube • Plastic toy

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