A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 348
ngth. But if the luminousbody be smaller than the opaque body the shadow will be a trun-cated pyramid, the larger base of which must be at an infinitedistance. In the former case the rays of light will proceed in pa-rallel lines till they are intercepted, and the consequent shadowwill preserve the… … 39. This will further appear from considering the relative di-mensions of the bame figure when the shadow is thrown on aplane surface at different distances from the source of light. Thuslet A be an object illuminated by the light of a candle, and B, C,D, E, be a succession of screens, B being the…
Physics
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