A shaman is a tribal healer who can act as a medium between the visible world and the spirit world. Shamans are kind of a mix between priests and doctors. Like a priest, a shaman is a holy man who represents a religion â in this case, shamanism. Like a doctor, a shaman heals people â or at least claims to do so. If you're not into shamanism, you can use this term more generally: A really good teacher, especially one who works a little mysteriously, might be said to work like a shaman.
While the response is activated by the physics of light waves, the response itself is both physiological and psychological. Suppose that white light-i.e., light consisting of the full range of wavelengths within the visible light spectrum-is incident upon the retina.
Visible light is the light that we can see, and thus is the only light detectable by the human eye. White light is visible light, and it contains all the colors of the rainbow, from red to violet. Ultraviolet light is the radiation from the sun that causes a sunburn when you have been outside too long on a sunny day.