Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 378
s to cause transmittedrays to converge ; that of concave lenses, to cause them to diverge.Incident rays parallel to the principal axis of a convex lens are brought to a focus F(Fig. 268) at a point in theprincipal axis. This pointis called the principal focus,i.e. it is the focus of incidentrays… … Fig. 267.
Physics
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