An object that reflects green and red light would be some shade of yellow or orange, depending on the proportions.
Assuming that the light you are shining on the object is white, then the object is also blue. Objects appear a certain color because they reflect that color to our eyes and the rest of the colors in the light are absorbed by the object.
It appears the color of light it reflects.
If it reflects that color of light, you're eyes will see that color being reflected by the object (when the color is being shown on the object, white light contains 'all' colors of visible light). If an object absorbs a color of light you will tend not to see it coming off of the object. Translation: objects will appear the color(s) of light that it reflects. If an object appears red, it reflects red light.
because whatever color you see is the color the object reflects in light.
Since an object is observed as the color(s) it reflects, a green object absorbs all colors and reflects green.
An object that reflects green and red light would be some shade of yellow or orange, depending on the proportions.
The color of an object has to do with the waves of (visible) light that it reflects. When light hits an object some is absorbed and some reflects, e.g. white is white because all the colours are reflected back; black is black because none of the colours are reflected, red is red because only red reflects from the object. Plants are green because the chlorophyll reflects the colour green, making them appear green to us.
The object will appear to be blue. However, the object would be indistinguishable from an object that reflects all colors of light. If yellow light were shone on an object that reflects only blue wavelengths, the object would appear to be black.
White.
The color of an object has to do with the waves of (visible) light that it reflects. When light hits an object some is absorbed and some reflects, e.g. white is white because all the colours are reflected back; black is black because none of the colours are reflected, red is red because only red reflects from the object. Plants are green because the chlorophyll reflects the colour green, making them appear green to us.
Many objects do appear black or white when light falls on them. If they are black, it means that the object is absorbing all wavelengths of visible light and not reflecting any. If they are white, it means that they are reflecting all wavelengths of visible light and not absorbing any. The color of an object is due to the wavelengths of light that it reflects.
The color of an object is determined by the color/s that it reflects. All other colors are absorbed. White objects reflect all colors, and black objects do not reflect any colors.