They have recently been ported to Java by Adam Doppelt . To view the interactive illustrations themselves, you must be running a Java compatible browser, such as Netscape Navigator. This matches physiological evidence that there are three types of color-receptor cells in the eye. In most ordinary light, there is a mix of various frequencies, and at a macroscopic scale, one can indicate this mix of photons by drawing a graph of intensity versus frequency. If light is generated very carefully, it sometimes consists of photons that all have the same energy, so that the light is of a single frequency.
Laser light is the standard example of a monospectral light.
Second, the green cells will respond to monospectral light of many different wavelengths. The area under this product curve is shown on the bar indicator at the right. It's a surprising fact that different incoming light distributions can generate the same three total responses. The third illustration lets you examine this. But you can also draw, on the right, a more sawtooth pattern which produces the same total responses.