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.
The world is full of light. Visible light is made of seven wavelength groups. When light hits objects, some of the wavelengths are absorbed and some are reflected, depending on the materials in the object. The reflected wavelengths are what we perceive as the object's color.