Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1881 - 275 páginas |
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Página 26
... becomes smaller , the circles of dispersion , a ' b'c ' , become smaller in the same proportion ; and , therefore , the light from different points of the object is more and more separated on the receiving screen , and the image becomes ...
... becomes smaller , the circles of dispersion , a ' b'c ' , become smaller in the same proportion ; and , therefore , the light from different points of the object is more and more separated on the receiving screen , and the image becomes ...
Página 32
... become a cd ; this is called refraction . But also the different colors are unequally bent ; red is bent least and violet . most , the other colors lying between these extremes ; thus they are spread out over a considerable colored ...
... become a cd ; this is called refraction . But also the different colors are unequally bent ; red is bent least and violet . most , the other colors lying between these extremes ; thus they are spread out over a considerable colored ...
Página 39
... becomes small , and a large portion of the light is shut out . When the light diminishes , as in twilight , the circular fibers relax , the previously stretched radi- ating fibers contract by elasticity , and enlarge the pupil . At ...
... becomes small , and a large portion of the light is shut out . When the light diminishes , as in twilight , the circular fibers relax , the previously stretched radi- ating fibers contract by elasticity , and enlarge the pupil . At ...
Página 43
... becomes smaller , shows that this anterior surface becomes more convex . By careful ex- amination the iris , too , may be seen to protrude a little FIG . 19 . a F N b e F , lens adjusted to distant objects ; N , to near objects ; a ...
... becomes smaller , shows that this anterior surface becomes more convex . By careful ex- amination the iris , too , may be seen to protrude a little FIG . 19 . a F N b e F , lens adjusted to distant objects ; N , to near objects ; a ...
Página 44
... becomes more convex . But the question , " How is this done ? " is more difficult to answer . Helmholtz thinks it is done in the following manner : * It will be remembered that the lens is invested by a thin , transparent membrane ...
... becomes more convex . But the question , " How is this done ? " is more difficult to answer . Helmholtz thinks it is done in the following manner : * It will be remembered that the lens is invested by a thin , transparent membrane ...
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Términos y frases comunes
angle axis bacillary layer binocular eye binocular perspective binocular vision camera central spot ciliary muscle circle colors combined images cones corresponding points cross depth of space distant objects distinct double images evident exactly Experiment external images eyes by squinting farther fibers field of view figures finger focal adjustment foreground forms of perspective gaze heteronymously homonymously horizontal horopter identical points impression inches inclination interocular space inverted jects left eye lens less convergence light line of sight look median plane monocular images motion muscles naked eyes nearer nose object or scene oblique observer ocular optic axes optic chiasm optic convergence optic nerve outward parallel perceived perception of depth perfect image perfectly point of sight position projection rays refractive represent retina retinal images right and left right eye rotation sclerotic screen seen single side stereoscope stereoscopic pictures surface tion torsion turn the eyes unite visual lines visual result