Wright, Mark R., 1854- · London : Longmans · leaf 131
to come from a point/called thevirtual focus. Following the construction on page 120 it will befound that the rays from the object a b, after refraction, appearto come from a b, and produce a virtual upright image, lessthan the object. If we use a concave lens, and examine an object a b (fig.no),… … Fig. The Magic Lantern.—This instrument illustrates the usesof mirrors and lenses. A lamp-flame is placed, at the focus ofa mirror m ; thus all reflected rays are parallel; these rays meet
Physics
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-204-22.webp)
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