NATS 1745 Lecture Notes - Lecture 13: Electromagnetic Spectrum, Photon, Human Eye
22 Jul 2017
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Document Summary
Visible light spectrum of light human eye can see (red to violet) discovered by newton. Infrared light spectrum of light past red discovered by herschel. Ultraviolet light spectrum of light past violet discovered by ritter. Light a wave-like phenomenon that travels through space. Wavelength the distance from one peak to the next. A way of describing diff types of light. Measured in meters (or fractions of a meter) 1 nanometre is 1 billionth of a meter. Often given the symbol (greek letter lambda") Diff from one colour to the next is just their wavelength distance. Red light 600 nm longest wavelength. Each colour appears diff because of the way our eye responds to diff wavelengths. Perceived colour is a construct of eye and mind. Colour is entirely a human perception (no actual colour in nature) All wavelengths (including ultra and infra) travel at the same speed : the speed of light .
