stant object to a normal eye. The astronomicaltelescope consists of two convex lenses mounted so as to havea common axis. The first lens, called the object glass, is ofconsiderable focal length and forms at its principal focus areal inverted image of the distant object, the second lens or 97-98]… … Fig. 111. Consider a pencil of rays coming from a point P on a distantobject PQ. The object is so distant that the rays from P fallingon the object glass may be treated as parallel to the line PA.The object glass forms an image of P at p on the line PAproduced, and pq a real image of the object PQ…
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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-131-37.webp)
