Question

The waves that affect the perception of brightness of a color is

Answer 1

your question is -----> Perception of the brightness of a color in affected mainly by:
[A] The saturation of light waves

[B] The wavelength of light waves

[C] The purity of light waves

[D] The amplitude of light waves


solve :- generally people experience three characters of light wave ; colour , brightness and and saturation.
color depends on wavelength of wave,
brightness depends on amplitude of wave.
and saturation depends on complexity.

hence, answer is option (D).