Gilley, Frank M · Boston, Allyn & Bacon · leaf 311
y rubber bands in a holder, arranged to slide on ameter stick, which is fastened to a baseboard, as shown in Fig. 284;another holder to support vertically a card. Method /. — Place the board in such a position that a picture of adistant tree or chimney is formed on the screen, S. Move the screento… … Fig. 284. Move the lens, start over again, and make a new setting. Record thedistance in each case. The average of several measurements is theprincipal focal length of the lens, and is represented by the letter F.If the screen, S, were removed after the picture was focussed, anda plate of glass or…
Physics
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