PSYB57H3 Chapter Notes - Chapter 2: Vitreous Body, Pupillary Light Reflex, Ciliary Muscle
Document Summary
Chapter 2 the first steps in vision: from light to. Two ways to conceptualize light: wave. An oscillation that travels through a medium by transferring energy from one particle or point to another without causing any permanent displacement of the medium. Visible light waves have wavelengths between (violet) 400 and (red) 700 nanometres (nm; nm=10-9 metre: a stream of photons. Tiny particles that each consist of one quantum of energy. In empty space the electromagnetic radiation from a star travels in a straight line at the speed of light (about 186,000 miles per second: once it reaches the atmosphere: Some light will be absorbed or scattered (by encounters with dust) Most will make it through the atmosphere and will eventually hit the surface of an object. If it hits something light-surfaced, most of the light is reflected. If it hits something dark-surfaced, most of the light is absorbed.
