Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 570
, so that their foci coincide, a systemof reflectors is obtained with which a single lamp illuminates in twodirections at once. This arrangement is used in lighting staircases andpassages. f Fig. SI I 552 [545- CHAPTER III SINGLE REFRACTION. LENSES 545. Phenomenon of refraction.—Refraction is the… … surface separating thetwo media, it is notbent, but continuesits course in a rightline (fig. 512). The incide7it raybeing represented bySO (fig. 514), the re-fracted ray is the di-rection OH which lighttakes in the secondmedium ; and of theangles SOAand HOB,which these rays formwith the normal…
Physics
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