A Treatise on Optics |
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Page vii
... fixed lines of the spectrum , 159–161 ; mode of determining the refracting angle of a prism , -the minimum deviation of a given colour — and the index of refraction , —test of the law of refrac- tion , 162–165 ; standard scale of ...
... fixed lines of the spectrum , 159–161 ; mode of determining the refracting angle of a prism , -the minimum deviation of a given colour — and the index of refraction , —test of the law of refrac- tion , 162–165 ; standard scale of ...
Page 6
... fixed diameter , called the axis of the surface . Def . The focal length of a spherical reflecting or refract- ing surface is the distance between the surface and the prin- cipal focus , -measured along the axis . The distance Fq is ...
... fixed diameter , called the axis of the surface . Def . The focal length of a spherical reflecting or refract- ing surface is the distance between the surface and the prin- cipal focus , -measured along the axis . The distance Fq is ...
Page 36
... fixed stars . Thus the time required for light to travel from the Sun to the Earth is about 8 minutes . The discrepancies above referred to with respect to the eclipses of Jupiter's satellites were first noticed about A. D. 1675 ; but ...
... fixed stars . Thus the time required for light to travel from the Sun to the Earth is about 8 minutes . The discrepancies above referred to with respect to the eclipses of Jupiter's satellites were first noticed about A. D. 1675 ; but ...
Page 63
... fixed . This epicycloid is the caustic curve required ; it has a cusp at F , the geometrical focus of rays reflected at C , and touches the mirror at Q. 73. Rays diverging from a point are refracted at a plane surface , the caustic is ...
... fixed . This epicycloid is the caustic curve required ; it has a cusp at F , the geometrical focus of rays reflected at C , and touches the mirror at Q. 73. Rays diverging from a point are refracted at a plane surface , the caustic is ...
Page 101
... fixed in a polygonal frame which is made to revolve about a vertical axis passing through 0 , -the cylindrical beams transmitted through these annular lenses sweep the horizon and produce a revolving or periodic light . ( ii ) If we ...
... fixed in a polygonal frame which is made to revolve about a vertical axis passing through 0 , -the cylindrical beams transmitted through these annular lenses sweep the horizon and produce a revolving or periodic light . ( ii ) If we ...
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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.