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What visible wavelengths will be constructively reflected if the film is surrounded by air on both sides?

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MissPhiladelphia

The visible wavelengths constructively reflected by the film when it is surrounded by air on both sides can be calculated using the equation:

lambda = 2t*(n2/n1)

where:

lambda is the wavelength,
t is the thickness, and;
n1 and n2 are indexes of refraction

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