ical pencil of rays proceeding from p to fillthe pupil of the eye and produce the rays back to meet thelens in RR. Join R R to P. Then a conical pencil divergingfrom P is made by the lens to converge to p, and on divergingthence enters the eye and produces vision; the eye sees pq,the image of PQ… … Fig. 100. Examples. Many examples on lenses can be solved by aid of agraphical construction; if the drawings are done carefully and to scalenumerical results may be readily obtained. In working examples by the aid of the formula, it is much the bestplan to adhere to the standard form = -. If the…
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