The Refraction and Accommodation of the Eye and Their AnomaliesPentland, 1886 - 600 pages |
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Page 6
... Hence a'd is the first wave - surface which contains all the light of the pencil . It forms , in the second M M ' S 6- FIG . 2 . medium , with the surface SS , the angle b ' a ' d . This we call r . Now , b'c being perpendicular to a a ...
... Hence a'd is the first wave - surface which contains all the light of the pencil . It forms , in the second M M ' S 6- FIG . 2 . medium , with the surface SS , the angle b ' a ' d . This we call r . Now , b'c being perpendicular to a a ...
Page 7
... Hence n indicates how much more or less rapidly light is propa- gated in the second than in the first medium , and how much the sine of the angle of refraction is smaller or greater than that of the angle of incidence . The absolute ...
... Hence n indicates how much more or less rapidly light is propa- gated in the second than in the first medium , and how much the sine of the angle of refraction is smaller or greater than that of the angle of incidence . The absolute ...
Page 14
... hence parallel to the surface at the place where it comes in contact with it . Another will fall upon the surface at B , at an angle LBY ; it will be deviated . The corresponding angle of refraction will be CBB ' . Hence the ray will ...
... hence parallel to the surface at the place where it comes in contact with it . Another will fall upon the surface at B , at an angle LBY ; it will be deviated . The corresponding angle of refraction will be CBB ' . Hence the ray will ...
Page 21
... Hence we have- Whence it follows that F " = G ' FG " . Hence F " G " + r F ' + r . = F " - Fr. Therefore the difference between G ' and G " is likewise equal to r . But there exists still another relation between F ' and F " , a ...
... Hence we have- Whence it follows that F " = G ' FG " . Hence F " G " + r F ' + r . = F " - Fr. Therefore the difference between G ' and G " is likewise equal to r . But there exists still another relation between F ' and F " , a ...
Page 24
... hence f ' and ƒ " are positive ( Fig . 8 ) . Let us take an example . L ' being 250 millimetres in front of the surface , and F " and F ' , equal respectively to 20 and 15 millimetres , as in the preceding case , we shall have— f ...
... hence f ' and ƒ " are positive ( Fig . 8 ) . Let us take an example . L ' being 250 millimetres in front of the surface , and F " and F ' , equal respectively to 20 and 15 millimetres , as in the preceding case , we shall have— f ...
Other editions - View all
The Refraction and Accommodation of the Eye and Their Anomalies Edmond Landolt No preview available - 2023 |
The Refraction and Accommodation of the Eye and Their Anomalies Edmond Landolt No preview available - 2018 |
Common terms and phrases
acuteness of vision adapted ametropia amplitude of accommodation angle anisometropia asthenopia astigmatism atropine axis becomes binocular vision centimetres centre choroid ciliary muscle concave glass convex glass convex lens cornea correcting-glass correction corresponding crystalline lens determine diminished dioptric apparatus dioptric system dioptries diplopia direction distant vision divergent Donders dynamic refraction effort of accommodation emmetropia emmetropic eye equal focal distance formula fundus Hence horizontal hyperopia hyperopic hyperopic eye increase index of refraction infinity inverted Landolt latter lenses less lines of fixation luminous point luminous rays maximum medium metre metre-angles millimetres mydriatic myopes myopia myopic eye nearer nodal point object observed obtain Ophth ophthalmoscope optical optometer patient placed posterior principal focus principal meridians principal point prism produced punctum proximum punctum remotum pupil range of accommodation refractive power refractive surface retina retinal images second principal situated spasm spherical static refraction strabismus tion vertical visual acuteness
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