A Treatise on Optics |
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Page vii
... achromatic combinations , -possible but imperfect , 172 , 173 ; conditions of achro- matism for prisms , 174-176 ; for lenses , 177-181 ; circle of chromatic aberration , 182-184 ; colours of natural bodies , primary colours , 185 . 142 ...
... achromatic combinations , -possible but imperfect , 172 , 173 ; conditions of achro- matism for prisms , 174-176 ; for lenses , 177-181 ; circle of chromatic aberration , 182-184 ; colours of natural bodies , primary colours , 185 . 142 ...
Page 154
... Achromatic Combinations . 172. A combination of prisms or lenses is said to be achro- matic when the dispersion of the pencils of light refracted through them is reduced within the narrowest possible limits . We proceed to consider the ...
... Achromatic Combinations . 172. A combination of prisms or lenses is said to be achro- matic when the dispersion of the pencils of light refracted through them is reduced within the narrowest possible limits . We proceed to consider the ...
Page 155
... achromatic combination arises from the fact that the dispersion of a ray and the deviation of any particular colour - or the mean deviation , if for convenience we take this as a definite measure of the deviation of the ray - produced ...
... achromatic combination arises from the fact that the dispersion of a ray and the deviation of any particular colour - or the mean deviation , if for convenience we take this as a definite measure of the deviation of the ray - produced ...
Page 156
... achromatic combination will illu- minate a screen with light still slightly coloured and give rise - as we have before stated - to a secondary spectrum ( Art . 167 ) . The fixed lines in this spectrum do not generally preserve the same ...
... achromatic combination will illu- minate a screen with light still slightly coloured and give rise - as we have before stated - to a secondary spectrum ( Art . 167 ) . The fixed lines in this spectrum do not generally preserve the same ...
Page 158
... the deviations produced by them are in opposite directions ) , dyi = sin 41 cos ' cos αμ . , and if the axes of the two colours emerge parallel we must have dy = dy ,; sin cos o'cos y sin du : = αμη , 158 ACHROMATIC PRISMS .
... the deviations produced by them are in opposite directions ) , dyi = sin 41 cos ' cos αμ . , and if the axes of the two colours emerge parallel we must have dy = dy ,; sin cos o'cos y sin du : = αμη , 158 ACHROMATIC PRISMS .
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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.