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What exactly do you mean by "without change in frequency?" Isn't the light reflected off of these surfaces reflected with different wavelengths (i.e. frequencies)?


Since light is reflected without change in frequency, how does reflecting light off of a surface cause its perception to be different? I assume then that this would have to do with other factors.


Do we need to take the incident angle into account? It seems we need this angle to calculate the out radiance


Are there a set of reflection functions that are most commonly used?