Laurence, Lionel · London, School of Optics · leaf 252
Fig. Fig. 256. In this case the bottom lens of the objective is a hemisphere whose planesurface is towards the object, and, when immersed in cedar oil of the sameindex as that of the glass, the whole forms a single refracting body as shownin Fig. 256. The object is then placed at/*p and its… … Fig. 257. Fig. 258. Aplanatic Lens.—If, in a Cc. periscopic lens (Fig. 257), the object at/xfaces the concave surface, the virtual image at/2 is aplanatic when d\=fj, d2.In this case rx the radius of the first surface must be/x/(/i + 1), while that ofthe second surface must be [fx+t)/fi {t being…
Optics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
