Geometrical Optics: Adapted to the Use of the Higher Classes in Schools, Etc |
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Page 21
... instance on to one spot , we can do it by placing a parabolic mirror behind the spot , the larger the better , having the spot for focus . Suppose that we have , as before , a candle III . ] 21 REFLEXION AT A CURVED SURFACE .
... instance on to one spot , we can do it by placing a parabolic mirror behind the spot , the larger the better , having the spot for focus . Suppose that we have , as before , a candle III . ] 21 REFLEXION AT A CURVED SURFACE .
Page 44
... larger the angle of incidence is , the more light is reflected . 35. Suppose now that a conical shell of rays diverging from Q fall upon the plane refracting surface AB . The rays forming this shell will , by symmetry , all be refracted ...
... larger the angle of incidence is , the more light is reflected . 35. Suppose now that a conical shell of rays diverging from Q fall upon the plane refracting surface AB . The rays forming this shell will , by symmetry , all be refracted ...
Page 73
... larger . This has already been explained ( Art . 49 ) . Pliny in A.D. 79 , speaking of the manufacture of glass at Sidon , says , " siquidem etiam specula excogitaverat . " This word " specula " probably refers to lenses , as Pliny ...
... larger . This has already been explained ( Art . 49 ) . Pliny in A.D. 79 , speaking of the manufacture of glass at Sidon , says , " siquidem etiam specula excogitaverat . " This word " specula " probably refers to lenses , as Pliny ...
Page 87
... larger pencil of light from each visible point , on account of the rays entering it less divergent . On the contrary , a concave lens not only diminishes objects , but also renders them darker , because the rays are thus transmitted ...
... larger pencil of light from each visible point , on account of the rays entering it less divergent . On the contrary , a concave lens not only diminishes objects , but also renders them darker , because the rays are thus transmitted ...
Page 89
... larger and nearer than usual ... This was about 1590. No sooner was this interesting discovery made known ... than Galileo , Kepler , Descartes and other philosophers bent the whole force of their genius to the improvement and employ ...
... larger and nearer than usual ... This was about 1590. No sooner was this interesting discovery made known ... than Galileo , Kepler , Descartes and other philosophers bent the whole force of their genius to the improvement and employ ...
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Common terms and phrases
Algebra angle of incidence Aq AQ ARITHMETIC astronomical beam beginners BROOKE FOSS WESTCOTT called Cambridge caustic curve centre CHAPTER Christ's College circle CLASS-BOOK Clifton College cloth colours concave lens Conic Sections conical convex lens cornea course Crown 8vo direction divergent ELEMENTARY TREATISE English Examination Papers explain Extra fcap eye-lens figure focal length formed Fourth Edition Galilean Geometrical Focus glass Grammar Greek Head Master John's College late Fellow Latin lenses luminous point magnifying power minimum deviation mirror MIXED MATHEMATICS nearer numerous Examples object object-glass OPTICS parallel rays pencil of rays placed plane reflexion point q principal focus principles prism rays close rays fall rays from Q rays which fall reader red rays reflected rays reflecting telescope retina Schools Second Edition seen shew small pencil spectrum straight line student Suppose telescope tion TRIGONOMETRY violet
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