An Elementary Treatise on Geometrical Optics |
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Page 125
... vision is distinct , but that the vision is distinct only for a very small area about this spot . But the eye is usually in very rapid motion , and in an incredibly short space of time brings the various points of an object into ...
... vision is distinct , but that the vision is distinct only for a very small area about this spot . But the eye is usually in very rapid motion , and in an incredibly short space of time brings the various points of an object into ...
Page 126
Robert Samuel Heath. points of an object into distinct view . We are thus enabled to form a clear conception of a considerably extended object or surface . This is aided also by the duration of ... VISION . Periodic lights Binocular vision.
Robert Samuel Heath. points of an object into distinct view . We are thus enabled to form a clear conception of a considerably extended object or surface . This is aided also by the duration of ... VISION . Periodic lights Binocular vision.
Page 131
... distinct vision extending from five or six inches to infinity . Eyes for which the greatest distance of distinct vision is finite are called short - sighted , or myopic ; these eyes can only bring divergent pencils to a focus on the ...
... distinct vision extending from five or six inches to infinity . Eyes for which the greatest distance of distinct vision is finite are called short - sighted , or myopic ; these eyes can only bring divergent pencils to a focus on the ...
Page 132
... distinct vision through the spectacles . When the accommodating mechanism is perfect , we have only to choose f , so that the farther limit of distinct vision is at an infinite distance . We must therefore make x infinite when xb , and ...
... distinct vision through the spectacles . When the accommodating mechanism is perfect , we have only to choose f , so that the farther limit of distinct vision is at an infinite distance . We must therefore make x infinite when xb , and ...
Page 133
... distinct vision may be measured by making the person look through suitably chosen convex lenses , so that the points in question are brought within 12 inches from the eye , and then their distances can be measured on a divided scale ...
... distinct vision may be measured by making the person look through suitably chosen convex lenses , so that the points in question are brought within 12 inches from the eye , and then their distances can be measured on a divided scale ...
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An Elementary Treatise on Geometrical Optics (Classic Reprint) R. S. Heath No preview available - 2016 |
Common terms and phrases
achromatic angle of incidence aperture apparent magnitude astronomical telescope axis B₁ called caustic centre circle coloured concave concave lens conjugate foci converge convex lens corresponding Crown 8vo denote direction distinct vision Edited emerge parallel emergent ray equal equation extreme pencils eye-glass eye-lens eye-piece field of view final image focal length focal plane glass Hence illuminated inches incident ray inclined infinity instrument k₁ lenses linear magnitudes luminous magnifying power meet nodal points normal object object-glass object-mirror P. G. Tait pair of conjugate perpendicular placed plane mirror point Q position principal focus principal plane principal points prism pupil radii radius ray of light rays diverging reflected rays reflexion refracting surface refractive index respectively retina right angles second medium seen small mirror spectrum sphere spherical surface subtended suppose tangent theorem triangles vertex visual angle
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