Background: Normal white Sun light has a continuous spectrum in the whole of visible range. But, white light (rather what we perceive as white) coming out of a Monitor/TV is have only RGB in it and it looks white because of the Tricolor vision which excites all three types of cells in the eye. If we take a yellow object (say banana) to Sun light, it will look yellow because it reflects yellow light (wavelength) and this yellow wavelength light excites both Red and Green cells in the eye. Now, if we take the same Banana in front of a Monitor/TV which is displaying a white object, how should we perceive the color of the Banana? I was thinking that we should not be able to perceive the color because: The Monitor/TV puts out three different wavelengths (RGB) only, since the banana could reflect only yellow wavelength, it could not reflect the Red, Green or Blue wavelengths coming out of the Monitor/TV, that way it should be seen as dark. But, when I tried it, I could really see it as yellow. Could anyone explain this please?