A Treatise on Optics |
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Page 2
... called a medium . Such as a vacuum , glass , water , & c . 4. Def . When light emanates from a luminous point , we regard it as made up of rays , understanding by a ray the smallest portion of light which can be separately transmitted ...
... called a medium . Such as a vacuum , glass , water , & c . 4. Def . When light emanates from a luminous point , we regard it as made up of rays , understanding by a ray the smallest portion of light which can be separately transmitted ...
Page 3
... called direct , if the axis of the pencil coincides with the normal to the surface at the point of incidence in other cases the incidence is called oblique . 7. When light is incident on the surface of a medium different from that in ...
... called direct , if the axis of the pencil coincides with the normal to the surface at the point of incidence in other cases the incidence is called oblique . 7. When light is incident on the surface of a medium different from that in ...
Page 4
... called the refractive index between the two media for the particular species of light considered . It is a parameter which varies , ( i ) if the nature of the light be altered , ( ii ) if the relation between the two media be altered ...
... called the refractive index between the two media for the particular species of light considered . It is a parameter which varies , ( i ) if the nature of the light be altered , ( ii ) if the relation between the two media be altered ...
Page 6
... called the axis of the surface . Def . The focal length of a spherical reflecting or refract- ing surface is the distance between the surface and the prin- cipal focus , -measured along the axis . The distance Fq is called the ...
... called the axis of the surface . Def . The focal length of a spherical reflecting or refract- ing surface is the distance between the surface and the prin- cipal focus , -measured along the axis . The distance Fq is called the ...
Page 11
... called the axis of the surface . Def . The focal length of a spherical reflecting or refract- ing surface is the distance between the surface and the prin- cipal focus , measured along the axis . The distance Fq is called the aberration ...
... called the axis of the surface . Def . The focal length of a spherical reflecting or refract- ing surface is the distance between the surface and the prin- cipal focus , measured along the axis . The distance Fq is called the aberration ...
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Common terms and phrases
aberration achromatism angle of incidence axis QA bright centre circle of least coincides colours concave conical surfaces convex lens cos² Crown 8vo cuts the axis deviation diameter direct pencil distance emergent equation excentrical eye-glass eye-piece Fcap field of view fixed lines focal length geometrical focus Hence illumination image formed incident directly incident pencil index of refraction intersection lenses luminous point magnifying power medium object object-glass parallel rays passes pencil of parallel pencil of rays pencil whose axis perpendicular plane surface point of incidence point q position primary plane principal focus principal plane prism radius rays incident reflected or refracted reflected pencil reflexion or refraction refracted rays refracting angle refracting surface refractive index shew small oblique pencil small pencil spectrum sphere spherical reflector spherical surface subtends supposed telescope thin lens v₁ v₂ αμ
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