A Treatise on Optics |
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Page vi
... excentrical - axis of a surface , 59 ; oblique pencil reflected at a plane surface , 60 ; Formation of focal lines by an oblique pencil , -Def . of Primary and Secondary focal line , -circle of least con- fusion , 62-64 ; Illustration ...
... excentrical - axis of a surface , 59 ; oblique pencil reflected at a plane surface , 60 ; Formation of focal lines by an oblique pencil , -Def . of Primary and Secondary focal line , -circle of least con- fusion , 62-64 ; Illustration ...
Page vii
... Excentrical pencils 114 Aberration of a direct pencil , 129 ; form of a lens to produce minimum aberration for rays parallel , ―or not so , 130-132 ; examples , 133 ; Excen- trical pencil passing through one or more lenses - mode of ...
... Excentrical pencils 114 Aberration of a direct pencil , 129 ; form of a lens to produce minimum aberration for rays parallel , ―or not so , 130-132 ; examples , 133 ; Excen- trical pencil passing through one or more lenses - mode of ...
Page 49
... excentrical . A pencil is incident centrically when the axis of the pencil is incident at a definite point of the surface , called the centre of the face ; in other cases it is incident excentrically . A distinction must be preserved ...
... excentrical . A pencil is incident centrically when the axis of the pencil is incident at a definite point of the surface , called the centre of the face ; in other cases it is incident excentrically . A distinction must be preserved ...
Page 99
... excentrical pencil Qrs - we may still regard this excen- trical portion as diverging from or converging to the same point after reflexion or refraction . The student will bear in mind that this supposition is only approximately true ...
... excentrical pencil Qrs - we may still regard this excen- trical portion as diverging from or converging to the same point after reflexion or refraction . The student will bear in mind that this supposition is only approximately true ...
Page 100
... excentrical pencil is accurate to the same de- gree of approximation as is above supposed . Let F'be the principal focus of rays , proceeding from right to left suppose , either in the case of a lens or mirror ; Q the origin of the ...
... excentrical pencil is accurate to the same de- gree of approximation as is above supposed . Let F'be the principal focus of rays , proceeding from right to left suppose , either in the case of a lens or mirror ; Q the origin of the ...
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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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