bject is twice the focallength from the lens; 2d, when more than twice the focallength; 3d, when less than twice the focal length, but morethan once its length; 4th, when less than the focal length.Illustrate these cases by drawings.. Images of Concave Lenses are on the same side of thelens as the… … Fig. 79. The Microscope. — There are two kinds. The simplemicroscope consists of one convex lens so placed that thelight from an object at less than the focal length appearsto come from a much larger object (Fig. 79). The com-pound microscope consists of two or more lenses so arranged Light. 103…
Physics
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![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep02muss-70-17.webp)
