An Elementary Treatise on Geometrical Optics |
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Page 23
... inches and the diameter of its base 3 inches . A person looks over its rim so that the lowest point of the opposite side visible to him is 24 inches below the top . The cup is filled with water ; looking in the same direction he can ...
... inches and the diameter of its base 3 inches . A person looks over its rim so that the lowest point of the opposite side visible to him is 24 inches below the top . The cup is filled with water ; looking in the same direction he can ...
Page 85
... focal length and refractive index in air are , respectively , fr and ; show that the distance from the centre of the sphere for clear vision is 3r . 503 3. From a cubic inch of glass , the inscribed CHAP . IV . ] 85 EXAMPLES .
... focal length and refractive index in air are , respectively , fr and ; show that the distance from the centre of the sphere for clear vision is 3r . 503 3. From a cubic inch of glass , the inscribed CHAP . IV . ] 85 EXAMPLES .
Page 86
Robert Samuel Heath. 3. From a cubic inch of glass , the inscribed sphere is removed , a film of glass remaining at the points of contact . The cavity is filled with water . A bright point is placed on the axis at a distance of one inch ...
Robert Samuel Heath. 3. From a cubic inch of glass , the inscribed sphere is removed , a film of glass remaining at the points of contact . The cavity is filled with water . A bright point is placed on the axis at a distance of one inch ...
Page 131
... 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 retina . On the other hand , On the other hand ...
... 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 retina . On the other hand , On the other hand ...
Page 132
... inches from the eye , the use of a concave lens whose focal length is 6 inches , will cause the range of distinct vision to extend from 6 inches to infinity . On the other hand , in a long - sighted eye b is negative and therefore ƒ is ...
... inches from the eye , the use of a concave lens whose focal length is 6 inches , will cause the range of distinct vision to extend from 6 inches to infinity . On the other hand , in a long - sighted eye b is negative and therefore ƒ is ...
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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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