Why Does an Apple Look Red?

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    11-Jan-2016

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Why Does an Apple Look Red?. Title your paper, and record each of your observations. What color of light does a red filter allow to pass through to your eyes?. What about the green filter?. - PowerPoint PPT Presentation

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  • Why Does an Apple Look Red?Title your paper, and record each of your observations.

  • What color of light does ared filter allow to passthrough to your eyes?

  • What about the green filter?

  • Where is the light coming from in this room?

  • Use the diffraction grating and look at the roomlights.

  • If the light that fills this room is composed of many different colors, why is it that objectsilluminated by these lightsseem to be onlycertain colors?Record your answer

  • Draw this diagram on your paper

  • Our eyes and our brains interpret light of different wavelengths as different colors.

  • Now we will connect some of these ideas together.Can you explain why a green sheet of paper looks green?The starting point for your explanation should be the lightcoming from the light bulb.

  • The paper appears green because the green light reflects from it. What happens to the other colors of light?

  • View this green rectangle with the red and green filters and record what you see.

  • Can you explain the results you observed for the red filter?Green light isstopped byred filter, thus the paper looks dark.

  • We will now pause the show and reflect on which colors go through a red filter and which colors are stopped.In other words, how we were ablemake secret messages.

  • Now see if you can predict how a rectangle of red will appear through the red and green filters.The rectangle is light red through red filter and dark through the green filter.

  • Now see if you can predict how black and white will look through the red and green filters.White looks red through red filter and green through the green filter.Black still looks black through both filters.

  • What colors reflect off white and black surfaces?All colors reflect off white.All colors are absorbed by black, thus no colors reflect off black.

  • How will red and white stripes appear through the red filter?The red stripes appear to disappear.Can you explain why?