Anti-reflective coatings on lenses use thin-film interference to eliminate the reflection of a particular color. Suppose a glass lens (ng = 1.5) is covered with a thin film (nf = 1.38) to prevent green light (λ = 531 nm) from being reflected.  Part (a)  Write an expression for the minimum thickness the film can have, t.  Part (b)  Calculate the minimum thickness, t, in nanometers?

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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.