Q is less than that of MN. They the greatest visible area. QP is meas- therefore paint on the retina a new ured by the angle QLP, or by its equal image of O, which is so much the more qLp. vivid, as the surface of MN is greater — qLp=l£LB + BIjp, and that is, as it admits a greater quantity of… … AF as the curvature of PQ is greater; so That is, the linear magnitude of the field that the axis of the pencil which they of view is measured by the angle which form, cuts the common axis of the two the diameter of the pupil subtends at lenses in F, the focus of PQ. Conse- the center of the…
Engineering
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