A lens (n = 1.52) is coated with a film of magnesium fluoride (n = 1.25). What should be the least thickness of the film in order to minimize reflected light with a wavelength of 550 nm? a.4800 nm b.110 nm c.1800 nm d.600 nm

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.