image of the first point. A point and its geometrical image are spoken of as conju-gate foci, for if an object be placed in the position originallyoccupied by the image, an image will be formed in the original LIGHT. [CH. V position of the object, the two foci are therefore interchange-able. 50.… … Fig. 64. Let OA, fig. 64, be the axis of a concave mirror BAC, and letPR be a ray parallel to the axis falling on the mirror at R.Join OR, then since the mirror is spherical and 0 is its centre,OR is a normal to its surface. Make the angle ORp equal tothe angle ORP and let Rp cut the axis OA in q.…
Heat · Light
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
