A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 373
ed of the accuracy of such centring ?What is the effect of convex and concave lenses respectively ?Illustrate the manner that parallel rays are refracted by a convex lens ?What is meant by the principal focus of such a lens ?What is meant by the focal distance? How may this distance be known in… … come more convergent, andwill therefore be refracted toa focus at H, nearer the lensthan the point 0. The morea distant may be the point a, atwhich the rays would meet ifuninterrupted, the further willthe point H recede from thesurface of the lens towards 0,beyond which point it never goes; and the…
Physics
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