A Treatise on Optics |
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Page 3
... meet in a point , the pencil is divergent ; if the origin be infinitely distant , its limiting form is a pencil of parallel rays ; if the rays produced in direction of propagation meet in a point , the pencil is convergent . The degree ...
... meet in a point , the pencil is divergent ; if the origin be infinitely distant , its limiting form is a pencil of parallel rays ; if the rays produced in direction of propagation meet in a point , the pencil is convergent . The degree ...
Page 6
... meet Rq in t , it is sometimes convenient to distinguish Fq as the longi- tudinal aberration and Ft as the lateral aberration . 14. A pencil of parallel rays will consist of parallel rays after reflexion at a plane surface . Let QR , Q ...
... meet Rq in t , it is sometimes convenient to distinguish Fq as the longi- tudinal aberration and Ft as the lateral aberration . 14. A pencil of parallel rays will consist of parallel rays after reflexion at a plane surface . Let QR , Q ...
Page 8
... , and RN the normal to the surface at R. Since by the law of reflexion SR , QA lie in one plane , let them be produced to meet in q . Then since RN , qQ are parallel Ꭱ R -N A LRQA = < QRN therefore the angles RAq RqA = 8 REFLEXION.
... , and RN the normal to the surface at R. Since by the law of reflexion SR , QA lie in one plane , let them be produced to meet in q . Then since RN , qQ are parallel Ꭱ R -N A LRQA = < QRN therefore the angles RAq RqA = 8 REFLEXION.
Page 34
... meet at F , in the middle of a narrow slit EFG about an inch long and one - eighth of an inch broad , which is covered with a slip of fine tissue or oiled paper . The rectangular slit should have a slip of blackened card at F , to ...
... meet at F , in the middle of a narrow slit EFG about an inch long and one - eighth of an inch broad , which is covered with a slip of fine tissue or oiled paper . The rectangular slit should have a slip of blackened card at F , to ...
Page 35
... meets AC or AC produced in c . Then projection on plane AP , of the curved surface pq , = projection of the plane circle pq = T . cp .. ( Hymers , Three Dim . Art . 81 ) . Ap Therefore illumination at A from the sphere ( Art . 42 ) C п ...
... meets AC or AC produced in c . Then projection on plane AP , of the curved surface pq , = projection of the plane circle pq = T . cp .. ( Hymers , Three Dim . Art . 81 ) . Ap Therefore illumination at A from the sphere ( Art . 42 ) C п ...
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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
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Page 305 - Eumenides. The Greek Text with English Notes, and an Introduction, containing an Analysis of Miiller's Dissertations.