A Treatise on Optics |
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Page vi
... centre of a lens , 109 ; focal centres of a lens , 110 ; Discussion of an oblique pencil passing through a lens , 112 , 113 ; combinations of lenses , 114 ; approximate determination of the focus of a small oblique pencil , 115 ; Lenses ...
... centre of a lens , 109 ; focal centres of a lens , 110 ; Discussion of an oblique pencil passing through a lens , 112 , 113 ; combinations of lenses , 114 ; approximate determination of the focus of a small oblique pencil , 115 ; Lenses ...
Page 14
... centre and the surface . or If F , be the principal focus AF , 1 = F10 = 1 . 1 COR . 2. Since γ v + 1 - - 2 " we get by reduction и r 2 wv − ( w + v ) = 0 ; and .. ( ~ — 1⁄2 ) ( − 5 ) = ( 1 ) · uv - ( u и - - If F be the principal ...
... centre and the surface . or If F , be the principal focus AF , 1 = F10 = 1 . 1 COR . 2. Since γ v + 1 - - 2 " we get by reduction и r 2 wv − ( w + v ) = 0 ; and .. ( ~ — 1⁄2 ) ( − 5 ) = ( 1 ) · uv - ( u и - - If F be the principal ...
Page 16
... the position of the geometrical focus of a reflected pencil by its distance from the centre of the reflecting surface , instead of its distance from the point of incidence . Let Q be the origin of a pencil of light 14 REFLEXION AT A.
... the position of the geometrical focus of a reflected pencil by its distance from the centre of the reflecting surface , instead of its distance from the point of incidence . Let Q be the origin of a pencil of light 14 REFLEXION AT A.
Page 19
... centre : then QA is the axis of the re- fracted pencil ( Art . 17 ) . Let QR be any ray incident at R and refracted in a direction which cuts QA in q , F the geometrical focus . Join OR . Let AQ = u , AO = r , AF = v , lines being ...
... centre : then QA is the axis of the re- fracted pencil ( Art . 17 ) . Let QR be any ray incident at R and refracted in a direction which cuts QA in q , F the geometrical focus . Join OR . Let AQ = u , AO = r , AF = v , lines being ...
Page 20
... centre of the refracting surface is sometimes convenient . To find the distance of the geometrical focus of a pencil of rays from the centre after direct refraction at a spherical surface Let be the origin of a pencil of light whose 18 ...
... centre of the refracting surface is sometimes convenient . To find the distance of the geometrical focus of a pencil of rays from the centre after direct refraction at a spherical surface Let be the origin of a pencil of light whose 18 ...
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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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