Discussion
Match each cone type with its region of peak sensitivity.
List I
A. L cone
B. M cone
C. S cone
D. Rod
List II
1. short wavelengths, peaking in the blue violet
2. long wavelengths, peaking in the yellow green
3. peaking in the blue green at low light levels
4. medium wavelengths, peaking in the green
Answer: A
Correct answer: A-2, B-4, C-1, D-3
The four receptors peak at different points. The L cone peaks around 565 nm in the yellow green, despite conventionally being called the red cone; the M cone around 535 nm in the green; the S cone around 440 nm in the blue violet; and the rod around 498 nm in the blue green, which is why the scotopic curve sits shifted towards the blue.
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