Gilley, Frank M · Boston, Allyn & Bacon · leaf 314
ghtedpersons wear glasses of a or c; near-sighted persons wear 6. The different varieties areused together for photographic, microscopic, and telescopiclenses. A single lens does not give a perfectly clear image.Try a lens of large diameter, thick at the middle. , Noticethat with no position of the… … Fig. 287. a. double convex.&. double concave.0. plaoo-convex. d. plano-concave.6. concavo-convex.f. convexo-concave. 304 PRINCIPLES OF PHYSICS. Make a hole a little smaller tlian the lens in a piece of card-board. Put any one of the first three kinds of lenses (a, c, or e)over the hole, and try…
Physics
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