The Refraction and Accommodation of the Eye and Their AnomaliesPentland, 1886 - 600 pages |
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Page 10
... obtain in fact 1:33 . Let us solve the problem again by construction , which is no less instructive . The number 1.33 is equivalent to , and if we say that the sine of the angle of incidence is to that of the angle of refraction as 4 is ...
... obtain in fact 1:33 . Let us solve the problem again by construction , which is no less instructive . The number 1.33 is equivalent to , and if we say that the sine of the angle of incidence is to that of the angle of refraction as 4 is ...
Page 15
... obtain an image almost reduced to a point , if in producing it one does not use a very extended surface , but only a part of it near the axis . Referring to Fig . 7 , it will in fact be seen that the smaller the angle of opening of the ...
... obtain an image almost reduced to a point , if in producing it one does not use a very extended surface , but only a part of it near the axis . Referring to Fig . 7 , it will in fact be seen that the smaller the angle of opening of the ...
Page 16
... two equations , the first by the second , we obtain- sin L'AB sin AL " C L'C X sin CAL " = sin ALC CL According to our equation 1 a , we may write-. n'x sin L'A B = n " x sin CAL " . nr F " = n- 1. 14 PHYSICAL PORTION .
... two equations , the first by the second , we obtain- sin L'AB sin AL " C L'C X sin CAL " = sin ALC CL According to our equation 1 a , we may write-. n'x sin L'A B = n " x sin CAL " . nr F " = n- 1. 14 PHYSICAL PORTION .
Page 19
... obtain- F " : = n n " r n " - 4 a . When the first medium is air , whose index of refraction equals 1 , the formula becomes simpler . Let us again call the index of refrac- tion , of the second medium , n , and we shall have- For ...
... obtain- F " : = n n " r n " - 4 a . When the first medium is air , whose index of refraction equals 1 , the formula becomes simpler . Let us again call the index of refrac- tion , of the second medium , n , and we shall have- For ...
Page 20
... obtain- n ' n " - n ' ጥ In this particular case the point of union , of rays which were parallel in the second medium , is called the first principal focus or principal anterior focus . We shall designate it by p ' . The distance ' H ...
... obtain- n ' n " - n ' ጥ In this particular case the point of union , of rays which were parallel in the second medium , is called the first principal focus or principal anterior focus . We shall designate it by p ' . The distance ' H ...
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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