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The red filter filters out all colors except for red. The blue object absorbs all colors except blue. The red light falling onto its surface is absorbed and the object appears black.
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The red filter filters out all colors except for red. The blue object absorbs all colors except blue. The red light falling onto its surface is absorbed and the object appears black.
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Why
do things look colored
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White light is a mixture of red, blue and green lights. Objects that appear to be red, for example, absorb every other color except red. Green objects absorb all other colors and reflect green light. |
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The dye of this blue object absorbs every other color (red,green) so that only blue light is reflected. The blue light comes from the white light falling on it. If the light falling on the object contains no blue light then the object appears black. Explain what colour a red object would look if the light shining onto its surface was filtered through a blue filter? Click to see a 120Kb video of the solution. Explain what colour a blue object would look if the light shining onto its surface was filtered through a red filter? Show Solution
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The picture on the right has a green and a red filter placed on it. Explain why the area overlapping the two filters appears black? Click to see the solution Click to see a 120Kb video of the effect outlined on the right. |
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to see a 120kb video. Why does the wheel in the video appear white when
rotated at high speed? Mention persistence
of vision. The wheel in the video appears white but when paints of each colour are mixed the result is a black mixture rather than a white mixture. Explain why? Click to see a 120kb video. Why does the red object in the video appear black when the blue filter is placed over it? |
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