PHYS 142 Lecture Notes - Lecture 35: Specular Reflection, Diffuse Reflection
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7 Apr 2015
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Phys 142: electromagnetism and optics - lecture 35 : ray optics part 1. A light ray is defined as a line in the direction along which light energy is flowing. Any narrow beam of light, such as a laser beam, is actually a bundle of many parallel light rays. We can think of a single light ray as the limiting case of a laser beam whose diameter approaches zero. Light travels through a transparent material in straight lines called light rays. The speed of light is v = c/n, where n is the index of refraction of the material. Light rays do not interact with each other. Two rays can cross without either being affected in any way. Light interacts with matter in four different ways: At an interface between two materials, light can be either reflected or refracted. o: within a material, light can be either scattered or absorbed.
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