A Treatise on Optics |
From inside the book
Results 1-5 of 39
Page 25
... viewed by reflexion at a plane mirror by an eye in any posi- tion , the image is seen by pencils which enter the eye as if they pro- ceeded directly from the image , and this image will appear in the same position whatever be the ...
... viewed by reflexion at a plane mirror by an eye in any posi- tion , the image is seen by pencils which enter the eye as if they pro- ceeded directly from the image , and this image will appear in the same position whatever be the ...
Page 31
... viewed obliquely by an eye E , the amount of light received from it will be the same as that received from a portion AB viewed di- rectly : AB being the section , perpendicular to the axis of the cone , of which E is the vertex and A'B ...
... viewed obliquely by an eye E , the amount of light received from it will be the same as that received from a portion AB viewed di- rectly : AB being the section , perpendicular to the axis of the cone , of which E is the vertex and A'B ...
Page 34
... viewed through a tube blackened within , one end resting upon the upper part AB of the photometer , the other applied quite close to the eye . When the lights are thus exactly equalized , it is clear that the total illuminating powers ...
... viewed through a tube blackened within , one end resting upon the upper part AB of the photometer , the other applied quite close to the eye . When the lights are thus exactly equalized , it is clear that the total illuminating powers ...
Page 54
... viewed by reflexion or refraction , we may consider the visible image to be the locus of the circles of least confusion of small oblique pencils emanating from consecutive points of the object ; the position of any one of these being ...
... viewed by reflexion or refraction , we may consider the visible image to be the locus of the circles of least confusion of small oblique pencils emanating from consecutive points of the object ; the position of any one of these being ...
Page 74
... viewed through a plate denser than the surrounding medium . 86. When a small pencil is refracted obliquely through a portion of medium bounded by two given surfaces , there is an apparent difficulty at the second refraction in ...
... viewed through a plate denser than the surrounding medium . 86. When a small pencil is refracted obliquely through a portion of medium bounded by two given surfaces , there is an apparent difficulty at the second refraction in ...
Other editions - View all
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.