Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 325
Spherical Concave Mirror. r = radius, and f = \r, focal distance of themirror. 2 = Or dr r—2 d r—2 d The image disappears when d =/= i r. 308 … 1 = Spherical Concave Mirror.Or ;,_ Br d = : 2 B—r 2 D—r When the object is beyond the focaldistance the image will be inverted. 309 )• T>
Mechanical engineering · Engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![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-182-20.webp)
