the centre of thesphere, F the principal focus, so that FOA is the axis, and let Let PQ be a small object. Draw PR parallel to the axisand join FR. After refraction the path of the ray PR willbe FR produced. Join PO and let it meet the surface in T. 1 A proof of this formula will be found in… … Fig. 79. formed by refraction, and if pq be perpendicular to the axis,Q and q are conjugate foci and pq is the image of PQ. Wecan discuss the various cases which arise for different positionsof the object in a manner similar to that employed in Section53. The discussion however is not of very great…
Heat · Light
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