Malus's Law (Polarisers)
Calculate the light intensity transmitted through one or two polarising filters at a given angle, free online.
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Malus's law: I = I₀ cos²θ for polarised light hitting an analyser at angle θ. Unpolarised light loses half its intensity passing through the first polariser (I = I₀/2) before Malus's law applies to the next one.