Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1881 - 275 páginas |
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Página 8
... screen , 248 ; to see through a book or a deal board , 250 . PAGE 192 213 CHAPTER IV . VISUAL PHENOMENA IN OCULAR DIVERGENCE 1. In drowsiness , 252 ; 2. In other modes of producing diver- gence , 255 ; 3. Prevalence of law of ...
... screen , 248 ; to see through a book or a deal board , 250 . PAGE 192 213 CHAPTER IV . VISUAL PHENOMENA IN OCULAR DIVERGENCE 1. In drowsiness , 252 ; 2. In other modes of producing diver- gence , 255 ; 3. Prevalence of law of ...
Página 25
... the hole h of diaphragm d d , will form a diverging pencil , and spread out over the whole circle b ' , on the screen s s . Similarly , the rays from a will spread out and form the circle a ' , and FORMATION OF THE IMAGE . 25.
... the hole h of diaphragm d d , will form a diverging pencil , and spread out over the whole circle b ' , on the screen s s . Similarly , the rays from a will spread out and form the circle a ' , and FORMATION OF THE IMAGE . 25.
Página 26
... screen ; much more , then , would rays from contigu- ous points of the object mix . In such a case , the mixing is so great that no recognizable image is formed at all . FIG . 6 . b b d . d d S A a d B S b As the hole becomes smaller ...
... screen ; much more , then , would rays from contigu- ous points of the object mix . In such a case , the mixing is so great that no recognizable image is formed at all . FIG . 6 . b b d . d d S A a d B S b As the hole becomes smaller ...
Página 27
... screen . In the shade of a very thick tree - top the sun - flecks are circular like the sun ; but during an eclipse they are crescentic , or even annu- lar , according to the degree of obscuration . They are always images of the sun ...
... screen . In the shade of a very thick tree - top the sun - flecks are circular like the sun ; but during an eclipse they are crescentic , or even annu- lar , according to the degree of obscuration . They are always images of the sun ...
Página 28
... screen is suitably placed , i . e . , at the exact place where the rays meet . The billions . of rays from millions of points of the surface of the object are , as it were , sifted out by the law of refraction , and each safely conveyed ...
... screen is suitably placed , i . e . , at the exact place where the rays meet . The billions . of rays from millions of points of the surface of the object are , as it were , sifted out by the law of refraction , and each safely conveyed ...
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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