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Quantum Physics

We have seen in the previous chapter that the properties of refraction, diffraction, and interference all require a wave picture of light. In this chapter we will begin to study other aspects associated with light which cannot be explained with a wave picture, but in fact need a particle picture. The coexistence of phenomena which require both a wave and a particle picture is called a wave-particle duality, and is at the heart of the modern theory of quantum physics.