Review Review of exam. Importance of f number. We do not see, e.g., so much of this, so much of that when we look at brown. Hence, color is as much how we process it as it is its basic nature. A single wavelength that seems red at low intensity, may seem orange as the intensity is increased.
Most colors consist of many wavelengths mixed together.
To describe this, we use the intensity distribution curve . Trans of Fig. Look at the light through a filter. We need a way of describing color as we see it. We find that we need only three numbers to specify a color.