Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 611
needle itself, it appears single andclearly defined ; as soon, however, as we look at a more distant object, theneedle appears double, and at the same time blurred. If we block out theright-hand hole, the left-hand image disappears, and vice versa. If we now fix the eye on an object nearer than the… … Fig. 382. Let AB (fig. 582) be the two holes in the card CC, O a luminous point inthe needle, OA, OB the pencils of rays passing through the apertures in thecard. Let H, E, M represent the position of a hypermetropic, normal, andmyopic eye respecti\-ely. When the normal eye E is accommodated for…
Physics
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