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is rather vague. Are you thinking of the amplitudes as vectors? Is the superposition required to increase or decrease the total (norm of the vector) amplitude? The answer to the question (i.e. whether perpendicular polarizations "interfere") will depend on how you specify those details.

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On a general footing, you can think of "interference" as any effect that results from the coherent combination of different waves. This covers e.g. the creation of circular polarizations by combining orthogonal linear polarizations at the correct relative phase.

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Note that the amplitudes of electromagnetic waves have a particular direction in space (perpendicular to the direction of propagation). The interference of such waves depends on their relative polarization directions, and the total intensity$^1$ for two linearly polarized EM waves is given by $$I = I_1 + I_2 + 2(I_1I_2)^{\frac{1}{2}}\cos(\Delta\phi)$$ where $\Delta\phi$ is relative angle of the two waves.

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We can see that if $\Delta\phi=90^o$ the third term goes to zero (the intensities simply add up so that there is no interference, as oppose to the case where $\Delta\Phi=180^o$ in which case there will be interference).

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But more specifically, "interference" is often understood in a more restricted sense as referring only to increases or decreases of the total observed intensity as a result of the superposition of two different waves. In this case, the MIT OCW resource is correct: constructive and destructive interference does not occur for perpendicular polarizations but it does occur for parallel polarizations.

And the superposition of two linearly polarized light waves with perpendicular polarization components, can result in linear, elliptical, or a circular polarized wave, but this depends on the amplitudes and the phase difference between polarization components of the two waves. See quarter wave plate.

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In the MIT ME optics OCW slides, it is written that parallel polarized waves do interfere but perpendicularly polarized waves do not interfere. However, isn't circular polarization formed by the interference of 2 perpendicularly polarized waves with some phase difference?

Anti-reflective coatings have vastly improved in recent years. There are now hundreds of different types for each kind of lifestyle and patient need.

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