Which law describes characteristics of metamers?

Grassmann's Law is fundamental in understanding metamers, which are different combinations of wavelengths that produce the same visual perception of color. This law states that the color perceived from a mixture of two spectral lights can be predicted by the linear combination of their respective spectral power distributions, reflecting the additive nature of color mixing.

Metamers demonstrate that even though two color stimuli may be made up of different wavelengths, as long as they are perceived as the same color under a specific lighting condition, they are considered metamers. This relationship underlies the concept of color vision and how humans perceive colors based on the responses of the three types of cone photoreceptors in the retina. Grassmann's Law encapsulates how the human visual system interprets these mixtures, which is why it is the correct choice in this context.