fferentpositions of the object. In fig. 66, the object PQ is somedistance from the mirror, further away than 0, the centre ofthe sphere. The image pq is real, inverted and diminished.As PQ is moved to the left towards 0, pq moves to the rightand the two coincide at 0. When PQ is still further to… … Fig. 67. any one point of the object are parallel after reflexion. Whenthe object is placed between the mirror and its principal focusas in fig. 68, the reflected rays produced backwards, meetbehind the mirror. The image is virtual, erect and magnified. P
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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)
