PSYB51H3 Chapter Notes - Chapter 2: Vitreous Body, Retinal Pigment Epithelium, Pupillary Light Reflex
Document Summary
Chapter 2 - the first steps in vision: from light to neural signals. Light is a form of electromagnetic radiation (energy produced by vibrations of electrically charged material) 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. Photons: a quantum of visible light or other form of electromagnetic radiation demonstrating both particle and wave properties. Light is made up of waves when it moves, and it"s made up of photons when it"s absorbed. Light only makes up a tiny portion of the spectrum of electromagnetic radiation. Visible light waves have wavelengths between 400 and 700 nanometers. Light as it travels from a star to an eye. The electromagnetic radiation from a star travels straight at the speed of light (about 186,000 miles per second) Some of the starlight"s photons will be absorbed by encounters with dust, vapourized water.
