Interference patterns formed by test surfaces. A: flat surface, B & C: convex surface, D: irregular surface, 2 contact points.

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Photo credit: © Encylopaedia Britannica / Alamy / Afripics
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Keywords: &, 2, :, bands, circle, concentric, contact, convex, diagram, figure, flat, formed, fringe, glass, horizontal, illustration, illustrations, interference, irregular, isaac, lens, newton, optical, optics, patterns, physics, points., rings, science, shape, sir, surface, surfaces., test, wave