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lecture32 - 32 Even More Interference Effects Newtons Rings...

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32. Even More Interference Effects Newton’s Rings The Fabry-Perot Interferometer Anti-Reflection Coatings Single- and Multi-layer Advanced topic: Photonic crystals Natural and artificial periodic structures
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Newton's Rings Constructive interference occurs when an integral number of half wavelengths occur between the two surfaces (that is, when an integral number of full wavelengths occur between the path of the transmitted beam and the twice reflected beam). Although we see Newton's rings as clear evidence of the wave nature of light, Newton didn't. He thought light consisted of particles. To account for observations like the rings he had a story about the particles having “alternating fits of easy and hard refractability”.
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Thin film interference This effect also causes the colors in bubbles and oil films on puddles.
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