BIOL 1000 Lecture Notes - Lecture 2: Trichromacy, Opsin, Cone Cell
8 Oct 2017
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Document Summary
Two major functions of light: energy, information. Light: electromagnetic radiation: variable wavelength (distance between 2 peaks) and energy, typically measured in nanometers, wavelength and energy inversely related. What is light: the visible region of the electromagnetic spectrum that humans can detect with their eyes. How does light interact with matter: reflected off the object, transmitted through the object, absorbed by the object. Light as a source if information: many organisms use light as a source of information, photoreceptor: light sensor. The eye: an organ used to sense light, vision requires the brain to interpret signals to the brain from the eye. Important for vision, which distinguishes it from the eyespot. Camera eye: retina, cornea, lens, pupil, retina= rods and cones. Colour (chromatic) vision: cone cells: cone cells in the retina of the eye allow light of different wavelengths to be interpreted as colour in the brain, light waves the cone cell the brain colour.
