Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 362
AB rep-resent an object placedbetween the principalfocus and the center ofcurvature, then a 6 willrepresent the image ofthe object.Experiment .#. —Place a candle in an otherwise dark room 20 feetfrom the mirror, catch the focused light-waves upon a paper screen, andshow that the focus Is about… … Fig. 249. 344 ETHBB, DYNAMICS. flame, and that when the flame is raised the foeUs is depressed, and theconverse. (2) Show that when the flame is at the center of curvature,the focus is also there. (3) Show that when the flame is between thecenter of curvature and the principal focus, the focus of…
Physics
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