Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 360
E;and, consequently, the imageof the object lies betweenthose points as extremities. If, for the second ray to bedrawn from any point, weselect that ray which is par-allel with the principal axis,as AG (Fig. 245), it will not be necessary to measure angles.For this ray, after reflection, must pass… … Fig. 245. 342 ETHER DYNAMICS.
Physics
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