![]() ![]() But don’t get confused by this, as the irony is the red cones have nothing to do with the color red. They are short-wavelength (blue cells), middle-wavelength (green cells), and long-wavelength (red cells).įor simplicity, I’ll refer to the different cones by their color name, rather than wavelength sensitivity. The rod cells interpret light and darkness (black and white), while the cone cells interpret three different wavelengths which our brain interprets as color. When light enters our eyes, photosensitive cells called cones and rods interpret the light and send signals to our brain. When we look at something, what we see is the light that bounces off of it, and into our eyes. How does light gets converted to colors? When visible light hits something, some of the light gets absorbed, but some of it reflects off. Infrared is just beyond red, and ultraviolet is just below purple. Figure 2 puts this into perspective by showing you the part that humans can see from 400-700 nanometers, which is what we call visible light. ![]() The visible light spectrum that we see is part of a continuum of electromagnetic energy. ![]() Visible light breaks into different wavelengths as it bends in a glass prism ![]()
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