A Treatise on Optics |
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Page v
... 51 ; after reflexion at a spherical surface , 52 ; after refraction at a spherical surface , 53 ; Least circle of aberration , its formation , position and dimensions , 55 , 56 . 37 CHAPTER IV . Focal Lines of small oblique pencils ,
... 51 ; after reflexion at a spherical surface , 52 ; after refraction at a spherical surface , 53 ; Least circle of aberration , its formation , position and dimensions , 55 , 56 . 37 CHAPTER IV . Focal Lines of small oblique pencils ,
Page vi
... least con- fusion , 62-64 ; Illustration of geometrical and visible image , 65 ; Posi- tion of the Foci of a small oblique pencil after reflexion at a spherical surface , 66 ; the same after refraction at a plane or spherical surface ...
... least con- fusion , 62-64 ; Illustration of geometrical and visible image , 65 ; Posi- tion of the Foci of a small oblique pencil after reflexion at a spherical surface , 66 ; the same after refraction at a plane or spherical surface ...
Page 44
... Least Circle of Aberration . pencil of rays reflected or 55. Let AF be the axis of a pencil of refracted directly at a spherical surface ; Hr , hr the extreme rays in any plane section of the pencil through the axis , k M which meet in ...
... Least Circle of Aberration . pencil of rays reflected or 55. Let AF be the axis of a pencil of refracted directly at a spherical surface ; Hr , hr the extreme rays in any plane section of the pencil through the axis , k M which meet in ...
Page 45
... Least Circle of Aberration of the directly reflected or refracted pencil . Obs . In the preceding figure , the aberration is supposed to be towards the surface ; the student will have little difficulty in drawing a corresponding figure ...
... Least Circle of Aberration of the directly reflected or refracted pencil . Obs . In the preceding figure , the aberration is supposed to be towards the surface ; the student will have little difficulty in drawing a corresponding figure ...
Page 46
... least of the order y ' , - therefore y'.mt and y.mt may be neglected . Also the difference between Ar and As being the difference of the aberrations of the two rays Hr , Ks , is of the order y ' ; and therefore when multiplied by mt we ...
... least of the order y ' , - therefore y'.mt and y.mt may be neglected . Also the difference between Ar and As being the difference of the aberrations of the two rays Hr , Ks , is of the order y ' ; and therefore when multiplied by mt we ...
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Common terms and phrases
aberration achromatism angle of incidence axis QA bright centre circle of least cloth coincides colours concave converge convex lens cos² Crown 8vo cuts the axis determine deviation direct pencil distance emergent equation excentrical eye-glass eye-piece Fcap fixed lines focal length geometrical focus Hence illumination image formed incident directly incident pencil index of refraction intersection lenses luminous point magnifying power medium mirror object object-glass parallel rays passes pencil of light pencil of parallel pencil of rays pencil whose axis perpendicular plane surface point of incidence position primary plane principal focus principal plane prism radii radius rays incident reflected or refracted reflected pencil reflexion or refraction refracted rays refracting angle refracting surface refractive index retina shew small oblique pencil small pencil spectrum sphere spherical reflector spherical surface supposed telescope thin lens v₁ v₂ αμ аф
Popular passages
Page 305 - Eumenides. The Greek Text with English Notes, and an Introduction, containing an Analysis of Miiller's Dissertations.