Vladimir Varićak

“ It's known that one has to take as being negative for angle , since it is supplementary to . In which relation the magnitude of angle is with respect to angle , depends on the direction of motion of the mirror relative to the light source. In the case considered, angle is larger than , since it is related to the smaller perpendicular as parallel angle. ”

“ For the ratio of amplitudes and frequencies, Einstein gives the following equation:
Due to relation (2) we can write it in the form
or also
If equation (7) is considered, then it becomes
However, for the reflected ray it is
according to formula (28) on p. ”