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 space ...
... 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 space ...
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 . This се b a F N b F , lens adjusted to distant objects ; N , to near objects ...
... 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 . This се b a F N b F , lens adjusted to distant objects ; N , to near objects ...
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 cornea corresponding points cross depth of space distance distant objects distinct divergence double images evident exactly Experiment external images farther fibers field of view gaze Helmholtz heteronymous homonymous horizontal horopter horopteric line identical points Illustrations impression inches inclination interocular space inverted jects law of corresponding left eye left-eye image lens light line of sight look median line middle monocular motion muscles naked eyes nearer nose oblique observer ocular optic axes optic centers optic chiasm optic convergence optic nerve outward parallel perceived perception perfect image perfectly point of sight position projection pupil ray-lines rays refractive represent retina retinal images right and left right eye right-eye image rotation sclerotic screen seen single shut side stereoscope surface tion torsion turn the eyes vergence vertical meridian vibrations visual lines visual result