A Treatise on Optics |
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Page 3
... sides of the normal . ( ii ) The angles which the incident and reflected rays make with the normal to the surface at the point of incidence are equal . 9. Law of Refraction . When a ray is refracted at the surface of a medium , ( i ) ...
... sides of the normal . ( ii ) The angles which the incident and reflected rays make with the normal to the surface at the point of incidence are equal . 9. Law of Refraction . When a ray is refracted at the surface of a medium , ( i ) ...
Page 9
... side of it . COR . 1. Since the angles RqA , RQA are equal , the divergence of the incident and reflected pencils is the same . COR . 2. If the incident pencil be convergent , a similar investigation will shew , that it will converge ...
... side of it . COR . 1. Since the angles RqA , RQA are equal , the divergence of the incident and reflected pencils is the same . COR . 2. If the incident pencil be convergent , a similar investigation will shew , that it will converge ...
Page 13
... side of the point A the geometrical focus of the pen- cil lies , and the magnitude of v gives its distance from A. The four cases of the proposition are here subjoined as exercises for the student to investigate independently . ( i ) ...
... side of the point A the geometrical focus of the pen- cil lies , and the magnitude of v gives its distance from A. The four cases of the proposition are here subjoined as exercises for the student to investigate independently . ( i ) ...
Page 25
... sides of a man . As a simple illustration of this perversion , observe the image of a page of a book held before the mirror : or again , write a few words on a sheet of paper , take off the superfluous ink on a sheet of blotting paper ...
... sides of a man . As a simple illustration of this perversion , observe the image of a page of a book held before the mirror : or again , write a few words on a sheet of paper , take off the superfluous ink on a sheet of blotting paper ...
Page 27
... case of either of these , is a paraboloid of re- volution in which rays incident on the concave side of the surface and parallel to the axis will be reflected to the focus , and vice versa . This property of a paraboloid has SURFACES . 27.
... case of either of these , is a paraboloid of re- volution in which rays incident on the concave side of the surface and parallel to the axis will be reflected to the focus , and vice versa . This property of a paraboloid has SURFACES . 27.
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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.