A Treatise on Optics |
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Page 5
... obtained independently of reflexion . Of the law of refraction we shall speak hereafter when we come to explain the mode of determining the refractive indices of different substances . The law of reflexion seems to have been known in ...
... obtained independently of reflexion . Of the law of refraction we shall speak hereafter when we come to explain the mode of determining the refractive indices of different substances . The law of reflexion seems to have been known in ...
Page 12
... obtained independently ; thus , suppose a ray Q'R incident parallel to the axis QA to be reflected in direction Rq ' ( these lines QR , Rq ' are not drawn in the figure ) , then in the two triangles Qq'R , Rq'q , we have QRQ ...
... obtained independently ; thus , suppose a ray Q'R incident parallel to the axis QA to be reflected in direction Rq ' ( these lines QR , Rq ' are not drawn in the figure ) , then in the two triangles Qq'R , Rq'q , we have QRQ ...
Page 18
... obtained by making u = ∞ , and we get v = μ μ - .7 . COR . 2. To compare the degree of divergence of the pencil after and before refraction we must take the limit of the ratio RqA : RQA when R approaches A ; 2 this ratio = sin RqA sin ...
... obtained by making u = ∞ , and we get v = μ μ - .7 . COR . 2. To compare the degree of divergence of the pencil after and before refraction we must take the limit of the ratio RqA : RQA when R approaches A ; 2 this ratio = sin RqA sin ...
Page 23
... obtain a third image , formed by rays reflected at A , B , and again at A , and so on . Thus we get a set of images formed by rays first reflected at A , then at B , again at A , and so on in succession . 8 In like manner we should get ...
... obtain a third image , formed by rays reflected at A , B , and again at A , and so on . Thus we get a set of images formed by rays first reflected at A , then at B , again at A , and so on in succession . 8 In like manner we should get ...
Page 27
... obtain for the forms of the generating curves SP + HP = C , and SP - HP - C respectively , by proceeding in a manner similar to the above . These results can of course be obtained independently by direct investigation . They represent ...
... obtain for the forms of the generating curves SP + HP = C , and SP - HP - C respectively , by proceeding in a manner similar to the above . These results can of course be obtained independently by direct investigation . They represent ...
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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.