chapter22 - Chapter 22 Reflection and Refraction of Light A...

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Unformatted text preview: Chapter 22 Reflection and Refraction of Light A Brief History of Light 1000 AD It was proposed that light consisted of tiny particles Newton Used this particle model to explain reflection and refraction Huygens 1678 Explained many properties of light by proposing light was wave-like A Brief History of Light, cont Young 1801 Strong support for wave theory by showing interference Maxwell 1865 Electromagnetic waves travel at the speed of light A Brief History of Light, final Einstein Particle nature of light Explained the photoelectric effect Used Plancks ideas Planck EM radiation is quantized Implies particles Explained light spectrum emitted by hot objects The Particle Nature of Light Particles of light are called photons Each photon has a particular energy E = h h is Plancks constant h = 6.63 x 10-34 J s Encompasses both natures of light Interacts like a particle Has a given frequency like a wave Dual Nature of Light Experiments can be devised that will display either the wave nature or the particle nature of light In some experiments light acts as a wave and in others it acts as a particle Nature prevents testing both qualities at the same time Geometric Optics Using a Ray Approximation Light travels in a straight-line path in a homogeneous medium until it encounters a boundary between two different media The ray approximation is used to represent beams of light A ray of light is an imaginary line drawn along the direction of travel of the light beams Ray Approximation A wave front is a surface passing through points of a wave that have the same phase and amplitude The rays, corresponding to the direction of the wave motion, are perpendicular to the wave fronts Reflection of Light A ray of light, the incident ray , travels in a medium When it encounters a boundary with a second medium, part of the incident ray is reflected back into the first medium This means it is directed backward into the first medium Specular Reflection Specular reflection is reflection from a smooth surface The reflected rays are parallel to each other All reflection in this text is assumed to be specular Diffuse Reflection Diffuse reflection is reflection from a rough surface The reflected rays travel in a variety of directions Diffuse reflection makes the dry road easy to see at night Law of Reflection The normal is a line perpendicular to the surface...
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This note was uploaded on 04/12/2011 for the course PHYS 1410 taught by Professor Staff during the Spring '08 term at North Texas.

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chapter22 - Chapter 22 Reflection and Refraction of Light A...

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