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Red and blue are primary colours therefore they do not contain any other colour. When a blue light is shone onto a red object, all the blue light is absorbed by the red object, and as no red light is being shone for the red object to reflect, no light will be reflected from it and it will appear to be black.

It is important to remember that physical colours will only reflect it's light colour equivalent. All other colours are absorbed. So red will reflect red, green will reflect green, and red will absorb green and so on.

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14y ago
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6mo ago

Red objects appear black in blue light because red and blue are complementary colors. When blue light shines on a red object, the object absorbs the blue light and reflects very little light, making it appear black to our eyes.

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Q: Why do red object's look black in blue light?
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A green object will appear dark or black under blue light because it does not reflect blue light well. Green objects absorb blue light, resulting in little to no reflection of this color.


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