A Treatise on Optics |
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Page vi
... curve , 57 ; mode of determining the form of a caustic , -catacaustics , diacaustics , 58 ; Def . of centres of the surface and face , incidence centrical and excentrical - axis of a surface , 59 ; oblique pencil reflected at a plane ...
... curve , 57 ; mode of determining the form of a caustic , -catacaustics , diacaustics , 58 ; Def . of centres of the surface and face , incidence centrical and excentrical - axis of a surface , 59 ; oblique pencil reflected at a plane ...
Page 23
... curve . The case of a reflecting paraboloid of revolution is how- ever of some interest , inasmuch as its properties are sometimes employed in large telescopes , like that of Lord Rosse . Illustrations and Examples . 32. A luminous ...
... curve . The case of a reflecting paraboloid of revolution is how- ever of some interest , inasmuch as its properties are sometimes employed in large telescopes , like that of Lord Rosse . Illustrations and Examples . 32. A luminous ...
Page 29
... curve required would be SP - u . HP C = ...... ( ii ) . COR . 2. If the surface is required which will reflect rays ... curve , and that rays diverg- ing from one focus of a hyperbola will after reflexion at the curve diverge from the ...
... curve required would be SP - u . HP C = ...... ( ii ) . COR . 2. If the surface is required which will reflect rays ... curve , and that rays diverg- ing from one focus of a hyperbola will after reflexion at the curve diverge from the ...
Page 30
... curve of the fourth degree . In the particular case of C = 0 , the surface will be a sphere . The discussion of aplanatic surfaces was originally pursued by Newton and Descartes , -in fact the class of curves included in the equation ...
... curve of the fourth degree . In the particular case of C = 0 , the surface will be a sphere . The discussion of aplanatic surfaces was originally pursued by Newton and Descartes , -in fact the class of curves included in the equation ...
Page 33
... curve bc . Take also an element B A C P of the surface BC , and let p be the corresponding element of the spherical surface formed as before . Let a , be the inclinations of AP to the illuminated plane and to the ILLUMINATION . 31.
... curve bc . Take also an element B A C P of the surface BC , and let p be the corresponding element of the spherical surface formed as before . Let a , be the inclinations of AP to the illuminated plane and to the ILLUMINATION . 31.
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Common terms and phrases
aberration achromatism angle of incidence axis QA bright centre circle of least coincides colours concave conical surfaces convex lens cos² Crown 8vo cuts the axis deviation diameter direct pencil distance emergent equation excentrical eye-glass eye-piece Fcap field of view fixed lines focal length geometrical focus Hence illumination image formed incident directly incident pencil index of refraction intersection lenses luminous point magnifying power medium object object-glass parallel rays passes pencil of parallel pencil of rays pencil whose axis perpendicular plane surface point of incidence point q position primary plane principal focus principal plane prism radius rays incident reflected or refracted reflected pencil reflexion or refraction refracted rays refracting angle refracting surface refractive index shew small oblique pencil small pencil spectrum sphere spherical reflector spherical surface subtends supposed telescope thin lens v₁ v₂ αμ
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