Gilley, Frank M · Boston, Allyn & Bacon · leaf 321
rage of three settings. In place of the distant object findthe focus of a light, a meter or .more away, or of the window sash.Record the distances from the lens to the screen, and from the lens to 1 Begin all laboratory exercises by finding the focal length of the lens used. 310 PRINCIPLES OF… … Fig. 295. rapidly. How does the focus of near objects compare with the prin-cipal focus? Which has the longer focus, an object 1 m. or 2 m.away? The object, 0, Fig. 295, may be a candle or an incandescent lampor a gas flame. In using these, measure from the lens to the wick orthe filament of the…
Physics
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