Discussion
The L and M cone sensitivities peak
Answer: B
Correct answer: quite close together, within about thirty nanometres
The L and M peaks lie at roughly 565 and 535 nm, an overlap so extensive that neither cone alone distinguishes red from green - the discrimination comes entirely from the ratio of their responses. Their similarity also explains why the two photopigments are so nearly alike genetically, and why red green deficiency is common.
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