The elements of natural and experimental philosophy .. (1834)
Phillips, R. (Richard), Sir, 1767-1840, Smith, E. A · New York, M'Elrath, Bangs & Herbert · leaf 125
are considered asparallel at the immense distance of the Earth. 413. How is it proved that the particles of light are exceedingly mi-nute? 414. What relation is observed between the quantities of lightreceived from a luminous body upon a given surface, and the distancesof the surface from a… … 2. To understand the nature of the convergency, divergency,and parallelism of rays of light, see Fig. 45. A candle at C,diverges rays of light towards x. They are said to converge,when considered as flowing from x towards C. And to be par-allel as flowing from x towards a and b. C, is the focus of…
Physics
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