EOSC 118 Lecture Notes - Lecture 12: Total Internal Reflection, Electromagnetic Spectrum, Color Theory
4 Dec 2017
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Introduction to colour and light / beryl (l12 - 15) Lesson 12 - colour, light, and optics i. Light = electromagnetic radiation (energy) which can behave like both waves + particles (photon) Can be described by wavelength, frequency, amplitude, constant speed of light Intensity varies according to wavelength in terms of photon particles; more intense light = more photons w/ higher frequency of incidence. Colour = our eye"s interpretation of the interaction btwn visible light and the object. Electromagnetic spectrum = continuous + represents various radiation energies. Visible region = 350-750 nm = white light = even mixture of light of wavelengths across the visible range. Subtractive colour theory = colours we see are complementary to colours absorbed ( subtracted ) Cyan-yellow-magenta plate, if all absorbed = black. Irregularities in absorbance plots (eg. bumps at random wavelengths) can help identify origin + identity of gemstone. Complementary colour theory = used to predict colour produced when pigments are mixed.
