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Physics · 术语表

什么是 Cones and trichromatic vision？

又称： rod · cone · trichromatic vision

Definition 11.1 High School Physics · 第 11 章 — Color and Light Sources

The retina (Chapter 10) carries two families of light-sensitive cells: the rods, which respond to faint light but ignore wavelength (night vision, in gray), and the cones, in three types most sensitive near $420\,\mathrm{nm}$ (blue), $530\,\mathrm{nm}$ (green) and $560\,\mathrm{nm}$ (red). Human color vision is trichromatic: whatever the spectrum, the brain receives only three cone responses, and color is what it makes of that triple.

示例

Example 11.3 (Two yellows)

The $589\,\mathrm{nm}$ line of a sodium lamp excites the red and green cones almost equally: the brain says yellow. A screen lighting its red ( $610\,\mathrm{nm}$ ) and green ( $540\,\mathrm{nm}$ ) subpixels gives the same yellow with no light near $589\,\mathrm{nm}$ . A prism separates the two instantly; the eye never can.

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