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Introduction to the Physics of Waves by Tim Freegarde

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9

Fraunhofer diffraction

9.1 More wave propagation around obstructions

When a wave has a choice of paths by which to reach a given destination, we have seen in Chapter 8 that the components add or subtract according to their relative phases upon arrival. When the number of contributing paths is small, we generally refer to their interference; when the number is large, it is more common to describe this as diffraction.

imagesPain [66] pp. 366–407French [29] pp. 284–298Main [60] pp. 320–339Hecht [40] Chapter 10Lipson et al. [56] Chapter 8Feynman [23] Vol. I, Chapter 30

As Feynman remarks in his Lectures on Physics, however, ‘no one has ever been ...

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