Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 204
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… … For the luminous object near the lens we use a light A,represented as a candle mounted upon a block C, whichslides upon the meter-stick M. The lens L and the screen8 are similarly arranged. The position of the lens can beso adjusted that the image of A falls on S when A is atdifferent distances…
Physics
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