Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
393. Figure 22. —Formation of images by concave mir-rors -when the object is beyond the centre of curvature.— Let 1 be the centre of curvature and F the principal focus. The linesAl and Hi, drawn from the extremities of the object through the Fig. 23. … centre of the mirror, are the secondary axes (390), in which the ex-tremities of the image, T, will be formed, at a distance from the mirrorequal to the conjugate foci (389) for the extreme points of the object. This image is real, inverted, smaller than the object, and placed be-tween the centre…
Physics · Astronomy
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