PSY100H1 Chapter Notes - Chapter 2: Photic Sneeze Reflex, Refractive Error, Optic Disc
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PSY100H1 Full Course Notes
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Chapter 2 first steps in vision: seeing stars. Light is form of electromagnetic radiation energy produced by vibrations of electrically charged material. Visible light waves have wavelengths between 400 and 700 nanometers: colour we observe changes from violent at about 400 nm through rainbow up to red at 650 nm. In empty space, electromagnetic radiation from a star travels in straight line at speed of light (186 000 miles per second) Once reaches atmosphere, some of starlight"s photons will be absorbed by encounters with dust, vaporized water, and so on; and some of light will be scattered by particles. Absorbed: to take up light, noise, or energy and not transmit it at all. Reflected: to redirect something that strikes surface especially light, sound or heat usually back toward its point of origin. Transmit: to convey something from one place to another.
