Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 351
object were placed before a screen without a lensbetween them, light would be reflected from every pointon the object to every point on the screen, so that eachpoint on the screen would receive an equal amount oflight from each and all points of the object. In order tohave a picture formed, each… … Fig. 227.—Conjugate foci. point m and fall upon the lens are collected at the pointm. This is one pair of conjugate foci. In the same wayall the rays which pass from n. to the lens are collected atn\ and these form another pair of conjugate foci. Butwhen the screen is placed in focus for the light…
Physics
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-112-295.webp)
