The range of wavelengths from the graph is approximately from blue — 400 nm to red — 700 nm.
From the graph, the rods have peak sensitivity at lower wavelength than cones.
Do rods have their peak sensitivity at a higher or lower frequency than cones? B. Do rods and cones have similar sensitivities near the red or near the violet edge of the visible spectrum? C. Is it easier to detect a dim red source or a dim violet source of light?
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