. The principles of physics. Fig. 243. FORMATION OF IMAGES. 341. Fig. 244. placed in front of them, proceed as follows : Locate the ob-ject, as DE (Fig. 244). Draw lines, E A and DB, from theextremities of the object throughthe center of curvature of the mir-ror, to meet the mirror. These linesare called secondary axes. Incidentrays along these lines will returnby the same paths after another line from D to anypoint in the mirror, to F, to rep-resent another of the infinite num-ber of rays emanating from D. Make the angle of reflectionCFD equal to the. angle of incidence C
. The principles of physics. Fig. 243. FORMATION OF IMAGES. 341. Fig. 244. placed in front of them, proceed as follows : Locate the ob-ject, as DE (Fig. 244). Draw lines, E A and DB, from theextremities of the object throughthe center of curvature of the mir-ror, to meet the mirror. These linesare called secondary axes. Incidentrays along these lines will returnby the same paths after another line from D to anypoint in the mirror, to F, to rep-resent another of the infinite num-ber of rays emanating from D. Make the angle of reflectionCFD equal to the. angle of incidence CFD, and the reflectedray will intersect the secondary axis DB at the point point is the conjugate focus of all rays proceeding fromD. Consequently, an image of the point D is formed at image is called a real image, because rays actually meetat this point. In a similar manner, find the point E, theconjugiate fpeus of the point E. The images of intermediate!? ^ points between D and E lie between the points D and E;and, consequently, the imageof t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
