An Elementary Treatise on Geometrical Optics |
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Page vii
... normal plane . 13. Successive reflexion at two plane mirrors . 14-16 . Laws of refraction . 17. Critical angle . Total internal reflexion . 18. Projections of the incident and refracted rays on a normal plane . 19 , 20. If the angle of ...
... normal plane . 13. Successive reflexion at two plane mirrors . 14-16 . Laws of refraction . 17. Critical angle . Total internal reflexion . 18. Projections of the incident and refracted rays on a normal plane . 19 , 20. If the angle of ...
Page 4
... normal * to the element of the surface . For suppose that a bright body is viewed through a tube of small aperture ; when the tube is directed so that the element of the bright surface seen is normal to the line of sight , let the area ...
... normal * to the element of the surface . For suppose that a bright body is viewed through a tube of small aperture ; when the tube is directed so that the element of the bright surface seen is normal to the line of sight , let the area ...
Page 5
... Let be the angle between the line OC and the normal at 0 . Then the illumination due to the bright element is με cos φ . is σ ; hence Describe a sphere of unit radius 4—6 . ] 5 ILLUMINATION . Illumination of surfaces.
... Let be the angle between the line OC and the normal at 0 . Then the illumination due to the bright element is με cos φ . is σ ; hence Describe a sphere of unit radius 4—6 . ] 5 ILLUMINATION . Illumination of surfaces.
Page 10
... normal is called the angle of incidence , and the acute angle between the reflected ray and the normal , the angle of reflexion . When the direction of a ray of light is changed by reflexions or refractions , the angle through which the ...
... normal is called the angle of incidence , and the acute angle between the reflected ray and the normal , the angle of reflexion . When the direction of a ray of light is changed by reflexions or refractions , the angle through which the ...
Page 11
... normal to it . Thus PQ produced will be the reflected ray . If the surface be not plane , we may substitute the tangent plane to the surface at Q , for the plane of the mirror in the previous construction . 11. When a ray is reflected ...
... normal to it . Thus PQ produced will be the reflected ray . If the surface be not plane , we may substitute the tangent plane to the surface at Q , for the plane of the mirror in the previous construction . 11. When a ray is reflected ...
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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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