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)
from a single point will be included within an angle of from one to alittle more than one-half o, degree. Therefore, the rays of vision differbut slightly from parallel rays. While, for all objects more remote, therays may be considered as parallel. Hence, distinct vision is oUained only ly rays… … but the image, T, of the point, L, on the retina, is formed by the fewnearly parallel rays that pass close to the secondary axis, LT; andwhat is true of the point L is true of all other points of the object. .457. Size of the image on the retina.—The actual size of theimage on the retina, capable…
Physics · Astronomy
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