The Refraction and Accommodation of the Eye and Their AnomaliesPentland, 1886 - 600 pages |
From inside the book
Results 1-5 of 77
Page 3
... called luminous rays . Thus it may be said that a luminous point gives off rays , which are propagated in all directions , in straight lines and with equal rapidity as long as they remain in the same medium . REFRACTION BY A PLANE ...
... called luminous rays . Thus it may be said that a luminous point gives off rays , which are propagated in all directions , in straight lines and with equal rapidity as long as they remain in the same medium . REFRACTION BY A PLANE ...
Page 4
... called the refraction of light.1 We give the name incident ray to the ray before its passage into the second medium , and that of emergent ray to the ray after it has penetrated the second medium . INDEX OF REFRACTION . Not all ...
... called the refraction of light.1 We give the name incident ray to the ray before its passage into the second medium , and that of emergent ray to the ray after it has penetrated the second medium . INDEX OF REFRACTION . Not all ...
Page 7
... called the index of refraction . It is then more simply written- sin i = n sin r . 1 . 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 ...
... called the index of refraction . It is then more simply written- sin i = n sin r . 1 . 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 ...
Page 9
... called simply the index of refraction . The following are the absolute indices of refraction for certain substances : - Crown glass , I. - Solids . 1.5 Flint glass , 1.57 to 1.58 Ice , 1.310 Rock crystal , 1.562 Quartz ( ordinary index ) ...
... called simply the index of refraction . The following are the absolute indices of refraction for certain substances : - Crown glass , I. - Solids . 1.5 Flint glass , 1.57 to 1.58 Ice , 1.310 Rock crystal , 1.562 Quartz ( ordinary index ) ...
Page 11
... called the limit angle . This is evidently the greatest value that the angle of refraction can have . We know that , for water , hence n = 418 3 = 0.75 . 1 n = 0.75 corresponds to the sine of 48 ° 35 ' . This is the limit angle for ...
... called the limit angle . This is evidently the greatest value that the angle of refraction can have . We know that , for water , hence n = 418 3 = 0.75 . 1 n = 0.75 corresponds to the sine of 48 ° 35 ' . This is the limit angle for ...
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
Popular passages
Page 611 - COMPEND" SERIES. A Series of Handbooks to assist Students preparing for Examinations. COMPEND of HUMAN ANATOMY, INCLUDING THE ANATOMY OF THE VISCERA. By SAMUEL OL POTTER, MA, MD, Cooper Medical College, San Francisco.
Page 611 - COMPEND of the PRACTICE of MEDICINE. By DANIEL E. HUGHES, MD, late Demonstrator of Clinical Medicine in the Jefferson Medical College of Philadelphia. Fourth Edition, revised and enlarged, Crown 8vo, Cloth, pp. 328. Price 7s. 6d. COMPEND of OBSTETRICS. By HENRY G.
Page 611 - A Compend of Obstetrics. Especially adapted to the Use of Medical Students and Physicians. By HENRY G. LANDIS, AM, MD, Late Professor of Obstetrics and Diseases of Women in Starling Medical College. Revised and Edited by WILLIAM H. WELLS, MD...
Page 615 - PRACTICAL PATHOLOGY AND MORBID HISTOLOGY. BY HENEAGE GIBBES, MD PROFESSOR OF PATHOLOGY IN THE UNIVERSITY OF MICHIGAN ; FORMERLY LECTURER ON HISTOLOGY IN THE MEDICAL SCHOOL, WESTMINSTER HOSPITAL.
Page 615 - HARE, MD, Professor of Therapeutics and Materia Medica in the Jefferson Medical College of Philadelphia ; Physician to St. Agnes...