Laurence, Lionel · London, School of Optics · leaf 323
round on a tool made for ^=1-52 and the glassemployed has ^=1-56, the power produced is 54 D as above. The dioptral tool D that should be employed to produce a given surfacepower D, when the glass is of /u2 and the tool is gauged for juv is D=D(^i) (/*2-l) OPTICAL AND OTHER INSTRUMENTS 311 Thus… … Fio. 322. ^ Telescopes. The Astronomical Telescope consists of two unequal convex lenses (Fig.322), separated by a distance d equal to the sum of their focal lengths,so that parallel light incident on the one lens emerges parallel from the other,but inverted and reversed. The lens of longer…
Optics
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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-70-16.webp)