A Treatise on Optics |
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Page 6
... consist of parallel rays after reflexion at a plane surface . Let QR , Q'R ' be any two rays of a pencil of parallel rays incident on a plane reflecting surface at the points R , R ' . Let RS be the di- rection of the ray QR after re ...
... consist of parallel rays after reflexion at a plane surface . Let QR , Q'R ' be any two rays of a pencil of parallel rays incident on a plane reflecting surface at the points R , R ' . Let RS be the di- rection of the ray QR after re ...
Page 7
... consists of parallel rays after refraction at a plane surface . Let QR , Q'R ' be any two rays of a pencil of parallel rays incident on a plane refracting surface at the points R , R ' . Let SR be the direc- tion of the ray QR after ...
... consists of parallel rays after refraction at a plane surface . Let QR , Q'R ' be any two rays of a pencil of parallel rays incident on a plane refracting surface at the points R , R ' . Let SR be the direc- tion of the ray QR after ...
Page 8
... consists of parallel rays . Remark . In the above figure the dotted lines SR , S'R ' are the directions of the refracted rays produced backward : it may not be amiss to suggest to the student that he will often avoid confusion in ...
... consists of parallel rays . Remark . In the above figure the dotted lines SR , S'R ' are the directions of the refracted rays produced backward : it may not be amiss to suggest to the student that he will often avoid confusion in ...
Page 10
... consist of a series of conical surfaces with a common axis , but dif- ferent vertices . The limiting position of the vertex q is the geometrical focus of the pencil . ( Art . 13. ) 18. The determination of the form of a direct pencil ...
... consist of a series of conical surfaces with a common axis , but dif- ferent vertices . The limiting position of the vertex q is the geometrical focus of the pencil . ( Art . 13. ) 18. The determination of the form of a direct pencil ...
Page 12
... consist of parallel rays , the formula becomes 1 2 or v = r ย r which assigns the position of the principal focus of the re- flector , viz . at a point on its axis equidistant from the centre and the surface . or If F , be the principal ...
... consist of parallel rays , the formula becomes 1 2 or v = r ย r which assigns the position of the principal focus of the re- flector , viz . at a point on its axis equidistant from the centre and the surface . or If F , be the principal ...
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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.