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when under a red light.
Red Light
An object appears a certain color to you because it reflects that color of light and absorbs other colors of light. For example, a white object appears white because it reflects all colors of visible light (red, orange, yellow, green, blue, indigo, violet). A black object appears black because it absorbs all of these colors--and as a result, none of those colors are reflected back to your eyes. Under white light, the object appears yellow-green because it reflects both yellow and green light and absorbs all other colors. (Remember, white light has all colors of visible light in it). If only green light is present, there's only green light for it to reflect--so it will appear green. If you shined yellow light on it only, it would be yellow. If you shined yellow and green light, it would appear yellow-green again. It you shined red and blue light on it, it would appear black, because it absorbs both of those colors.
Our eyes only see the colours red, green and blue, in varying levels. It is our brain that converts combinations of these into the many millions of colours that we can perceive.An object that appears yellow under white light is reflecting colours that cause both our red and green cones (cells in our eyes that respond to colour) to fire. Note we have no yellow cones in our eyes.When the same object is placed under red light, then only red light is reflected from the object, and thus only the red cones respond, causing us to see the object as red.
An object that appears yellow under white light will have a tendency to maintain its distinctly yellow appearance when bathed in yellow light.
It will be green
when under a red light.
Red Light
An object appears a certain color to you because it reflects that color of light and absorbs other colors of light. For example, a white object appears white because it reflects all colors of visible light (red, orange, yellow, green, blue, indigo, violet). A black object appears black because it absorbs all of these colors--and as a result, none of those colors are reflected back to your eyes. Under white light, the object appears yellow-green because it reflects both yellow and green light and absorbs all other colors. (Remember, white light has all colors of visible light in it). If only green light is present, there's only green light for it to reflect--so it will appear green. If you shined yellow light on it only, it would be yellow. If you shined yellow and green light, it would appear yellow-green again. It you shined red and blue light on it, it would appear black, because it absorbs both of those colors.
Our eyes only see the colours red, green and blue, in varying levels. It is our brain that converts combinations of these into the many millions of colours that we can perceive.An object that appears yellow under white light is reflecting colours that cause both our red and green cones (cells in our eyes that respond to colour) to fire. Note we have no yellow cones in our eyes.When the same object is placed under red light, then only red light is reflected from the object, and thus only the red cones respond, causing us to see the object as red.
An object that appears yellow under white light will have a tendency to maintain its distinctly yellow appearance when bathed in yellow light.
It would be black becasue the object would absorb all the red light, and there would be no green light for it to reflect
Why do you call it a "white object" ? Could it be because it looks white under white light ... light composed of every color ? Well then, the object must reflect every color. So it appears to be the color of whatever light you illuminate it with. Yellow under yellow light, etc.
Green objects reflect all green wavelengths of visible light, so if it is only under red light, it has no colors to reflect and appears black.
It would appear black because the object would not reflect any of the colors of light back.
White light is made up of all of the colors of the spectrum, so the green looks green because the green light is reflected back to your eyes while the other colors are absorbed. Under a red light, the green light is filtered out so there is no green to reflect so it looks black.
A green object is called "green" because that's the only color of light that it reflects to our eyes, while it absorbs any other light. If there's no green light shining on it, then there's nothing for it to reflect, and we would describe it as a "black" object under those conditions.