Poynting Vector Its magnitude is the amount of energycarried by the wave and its direction is the direction of propagation of the S light works To understand lenses mirrors and the other stuff o ID: 412091
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rectilir propt, ge © W. F. Long, 1992RREECCTTIILLIINNEEAARR PPRROOPPAAGGA Poynting Vector. Its magnitude is the amount of energycarried by the wave and its direction is the direction of propagation of the S light works. To understand lenses, mirrors, and the other stuff ofPoynting vector when light moves from one medium to another. In ray. We canLeft alone, rays don't change direction. This is called rectilinear Snell's Law or We can use the first of these laws to understand shadows. Suppose weobstruction is placed along the line connecting B to S. The size and shape of BS circular, is placed between a luminous object and a screen. Miraculuously, animage of the object appears on the screen. The principal is illustrated in thecombine to form a somewhat fuzzy image of the object. The smaller thepinhole, the sharper--and dimmer--the image. The size of object and image h' traverse the boundary with a change of direction. The latter is calledrefraction. Usually both things happen. of the two media. Here are material ophthalmic plastic1.49crown glass1.52flint glass1.62 'reflected rayrefracted rayincoming rayn' proportional to the speed of light in that material. If When light crosses an interface, the medium of greater index is called the dense medium and the index of lessor index is called the Huygen's Principle governing the propagation of waves. It's just as well,. In other