Abstract: We apply the four-vector formalism of special relativity to describe various interaction processes of photons with a solar sail, in two cases: when the sail's surface is a perfect mirror, and when it is a body coated with a totally absorbing material. We stress the pedagogical value of implementing simultaneously both the linear momentum and the energy conservation in a covariant fashion, as our formalism inherently does. It also allows for a straightforward change of the description of a certain process in different inertial reference frames

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