Lockyer, Norman, Sir, 1836-1920 · London : Macmillan and Co. · leaf 248
Fig. 45.—Action of a Convex Lens upon a beam of parallel rays. tliat when held at a certain distance from the lens a holewill be burned through it; this distance marks the focaldistance of the lens. If we place an arrow, ab, in front ofthe lens ;;/;/. v/e shall have an image of an arrow behind at … Fig. 46.—Showing how a Convex Lens, m «, with an arrow, a b, in front of it,throws an inverted image, a b, behind it. a I/, every point of the arrow sending a ray to every pointin the surface of the lens ; each point of the arrow, infact, is the apex of a sone of rays resting on the lens, anda…
Astronomy · Solar system
Internet Archive · OCAD University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Rudiments of the art of building : represented in five sections [...] for the use of architects, builders, draghtsmen, machinists, engineers and mechanics (1853)](https://img.insideoutlibrary.com/img/200/ia-rudimentsofartof00bull-124-61.webp)
