Misunderstanding of the Poynting-Robertson effect

The most frequent incorrect statements concerning derivations of the action of the solar electromagnetic radiation on the motion of interplanetary dust particles are presented. All of them are discussed and it is also explained why are they physically incorrect. It is stressed that astronomers must discuss the physics of this effect for the purpose of familiarity with it, and, may be, for better understanding of the (in-)stability of the zodiacal cloud.