Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 203
nly attached,Fig. 98, C. Attach the bodyto the lower end, as in Fig. 98,A, and record the length ofspring. Bring the vessel ofwater under the body, immersethe body with the usual pre-cautions, and again record thelength of the spring B. Calculations.—Reading ofreference-marks : Spring alone = With… … Fig. ! LIGHT.EXERCISE 1. FOCI OF LENSES. Preliminary.—When the light from a luminous body-passes through a double convex lens, the point at whichall the light is concentrated is called the focus of the lens.The distance from the centre of the lens to the focus iscalled the focal length. The…
Physics
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