A Treatise on Optics |
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Page 2
... luminous point or an origin of light is mentioned , we may understand it to be a minute portion of a luminous surface , in no direction perceptibly extended : and so by a luminous line we may understand such a surface per- ceptibly ...
... luminous point or an origin of light is mentioned , we may understand it to be a minute portion of a luminous surface , in no direction perceptibly extended : and so by a luminous line we may understand such a surface per- ceptibly ...
Page 21
... luminous point being placed between two parallel plane mirrors , to find the position of the images formed by suc- cessive reflexions at the mirrors . B Through the luminous point let the line AQB be drawn perpendicular to the two ...
... luminous point being placed between two parallel plane mirrors , to find the position of the images formed by suc- cessive reflexions at the mirrors . B Through the luminous point let the line AQB be drawn perpendicular to the two ...
Page 23
... luminous point Q , and perpendicular to each mirror , and therefore perpendicular to the line of intersection - which is represented by the point 0 . Q3 Q4 B Describe a circle with centre O and passing through Q. Draw QQ , perpendicular ...
... luminous point Q , and perpendicular to each mirror , and therefore perpendicular to the line of intersection - which is represented by the point 0 . Q3 Q4 B Describe a circle with centre O and passing through Q. Draw QQ , perpendicular ...
Page 29
... luminous point and is propagated in a uniform medium if we suppose its intensity unaltered by the absorption of any portion of it by the medium , yet from other causes the illumination at any point of a surface exposed to the light is ...
... luminous point and is propagated in a uniform medium if we suppose its intensity unaltered by the absorption of any portion of it by the medium , yet from other causes the illumination at any point of a surface exposed to the light is ...
Page 30
... point of the area ac cosine angle of incidence ( distance ) COR . The illumination at any point of the area = C ... luminous surfaces appear to be of the same brightness at any point , whatever be the inclination of the surface at that ...
... point of the area ac cosine angle of incidence ( distance ) COR . The illumination at any point of the area = C ... luminous surfaces appear to be of the same brightness at any point , whatever be the inclination of the surface at that ...
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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.