When light hits a material that has multiple layers, each layer can reflect light. Thin-film interference. Thicknesses on the order of 0.1 μm ~ 10 μm (¼λ ~ 10λ of visible light within the film) are considered "thin".Thin film interference can be both constructive and destructive. thickness: (a) Reflection Pattern: Let us consider a thin film of thickness t, refractive index µ and a ray AB of monochromatic light of λ is falling on it at an angle i. This is known as thin-film interference, because it is the interference of light waves reflecting off the top surface of a film with the waves reflecting from the bottom surface. Interference between light waves is the reason that thin films, such as soap bubbles, show colorful patterns. Thin Film Interference 12 n1 n2 n3 n1

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