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Wave Optics Chapter Ten WAVE OPTICS

351 Wave OpticsChapter TenWAVE INTRODUCTIONIn 1637 Descartes gave the corpuscular model of light and derived Snell slaw. It explained the laws of reflection and refraction of light at an corpuscular model predicted that if the ray of light (on refraction)bends towards the normal then the speed of light would be greater in thesecond medium. This corpuscular model of light was further developedby Isaac Newton in his famous book entitled OPTICKS and because ofthe tremendous popularity of this book, the corpuscular model is veryoften attributed to 1678, the Dutch physicist Christiaan Huygens put forward thewave theory of light it is this wave model of light that we will discuss inthis Chapter .

shape of the wavefront for a plane wave propagating through a medium (Fig. 10.3). FIGURE 10.3 Huygens geometrical construction for a plane wave propagating to the right. F 1 F 2 is the plane wavefront at t = 0 and G 1 G 2 is the wavefront at a later time τ. The lines A 1 A 2, B 1 B 2 … etc., are normal to both F 1 F 2 and G 1 G 2 and ...

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