find the image formed by a convergentpencil of rays. In some cases a convergent pencil of raysconverging to a point P falls on a concave mirror and isreflected. We can find the position of the image by themethod already used. For consider an incident ray parallelto the axis, it is reflected so as… … Fig. 75. fig. 75. It is clear that pq is the real image of an image PQwhich would be formed by the rays if they were not inter-cepted by the mirror before reaching PQ. 62-64-] REFLEXION AT SPHERICAL SURFACES. 105 64. To draw the rays by which an eye sees theimage of an object formed by reflexion in…
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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-78-23.webp)
