Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
e intensity of the light (orbrightness of the object) will be increased by the apparent diminu-tion of surface over which it is spread, in the same ratio that its in-tensity will diminish by the increase of distance, it follows that The apparent brightness of an object, and consequently of its… … confused and indistinct, because the rays, flowing from it, fall toodivergent on the crystalline lens to be refracted to a focus on theretina. If we could see objects distinctly when placed quite near the eye, weshould be able to examine things that are now invisible at the limit ofdistinct vision…
Physics · Astronomy
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