Physics Help Forum Light word question!

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 Mar 11th 2013, 04:22 PM #1 Junior Member   Join Date: Mar 2013 Posts: 5 Light word question! If a blue and red sweater are under a blue light what color will the sweaters appear?
Mar 11th 2013, 07:50 PM   #2
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 Originally Posted by Rachaelbee05 If a blue and red sweater are under a blue light what color will the sweaters appear?
the color we perceive for a sweater is the color of light that it reflects. Colors of light that are not reflected are absorbed. Does that help you answer the question?

If you need more help, tell us what you think the answer is, and why.
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 Mar 11th 2013, 08:02 PM #3 Junior Member   Join Date: Mar 2013 Posts: 5 So would the red sweater be black and the blue sweater be blue. Because the blue sweater absorbs blue but reflects. Since blue is not reds complement color it will cancel out and reflect black?
 Mar 11th 2013, 08:03 PM #4 Junior Member   Join Date: Mar 2013 Posts: 5 My reply is beneath yours
Mar 11th 2013, 08:04 PM   #5
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 Originally Posted by DrPhil the color we perceive for a sweater is the color of light that it reflects. Colors of light that are not reflected are absorbed. Does that help you answer the question? If you need more help, tell us what you think the answer is, and why.
Sorry my reply is beneath yours lol

Mar 12th 2013, 07:40 AM   #6
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 Originally Posted by Rachaelbee05 So would the red sweater be black and the blue sweater be blue. YES Because the blue sweater absorbs blue but reflects. Since blue is not reds complement color it will cancel out and reflect black?
Right results, but not exactly correct reasoning.
The blue sweater reflects blue, so if you shine blue light on it it will be reflected and the sweater will appear blue.
The red sweater absorbs blue, so if the only light you shine on it is blue, nothing will be reflected. No light reflected means the sweater looks black.
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DrPhil (not the TV guy)
If we knew what we were doing, we wouldn't have to do it.

Mar 12th 2013, 01:56 PM   #7
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 Originally Posted by DrPhil the color we perceive for a sweater is the color of light that it reflects. Colors of light that are not reflected are absorbed. Does that help you answer the question? If you need more help, tell us what you think the answer is, and why.
 Originally Posted by DrPhil Right results, but not exactly correct reasoning. The blue sweater reflects blue, so if you shine blue light on it it will be reflected and the sweater will appear blue. The red sweater absorbs blue, so if the only light you shine on it is blue, nothing will be reflected. No light reflected means the sweater looks black.
OH!! I see now! Totally makes sense. Thank you for your time. I'm in accelerated physics and our long term sub is difficult to understand. thanks for your time!

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