lecture 29

lecture 29 - Ch. 27. Interference and the Wave Nature of...

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Ch. 27. Interference and the Wave Nature of Light Up to now, we have been studying geometrical optics , where the wavelength f the light is much smaller than the size of our mirrors and lenses and the of the light is much smaller than the size of our mirrors and lenses and the distances between them. The propagation of light is well described by linear rays except when flected or refracted at the surface of materials reflected or refracted at the surface of materials. Now we will study wave optics , where the wavelength of the light is comparable to the size of an obstacle or aperture in its path. This leads to the wave phenomena of light called interference and diffraction . I am the blue Morpho butterfly, and I love physics!
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27.1 The Principle of Linear Superposition Take two waves of equal mplitude and wavelength and amplitude and wavelength and have them meet at a common point: If the two waves are in-phase , then they meet crest-to-crest and trough-to-trough. heir two amplitudes add to each other. In this case, the resulting wave would Their two amplitudes add to each other. In this case, the resulting wave would have an amplitude that doubled. This is called Constructive Interference (CI). or CI to occur we need the waves to meet crest rest thus the waves Define Optical Path Difference (OPD): OPD = The difference in distance that two waves travel.
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lecture 29 - Ch. 27. Interference and the Wave Nature of...

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