Answer to Question #66406 in Optics for Irshad

Question #66406

Why do edges of a thin film appear dark when illuminated by monochromatic light?

Expert's answer

It happens as a result of the interference between the two light waves: one from the top of the thin film and another after getting refracted from the film and reflected back. The path difference between the two waves is equal to one half of the wavelength of monochromatic light. Therefore when the waves superimpose on each other the destructive interference appears and we can see that the thin film is dark.

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30.03.17, 16:04

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Irshad

29.03.17, 19:17

Thanks so much

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