Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 624
tig- 585 … Fig. 586 observer. Thus, if AB is the object, and O the observers eye (figs. 585, 586),the apparent magnitude of the object is the angle AOB contained by twovisual rays drawn from the centre of the pupil to the extremities of the object.In the case of objects seen through optical instruments, the…
Physics
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