An Elementary Treatise on Geometrical Optics |
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Page 3
... radius whose centre is at the vertex of the cone . If a bright point be emitting light , and the quantity of light emitted within a cone of solid angle w be Q , then the mean intensity of emission within the cone is Q / w . When the ...
... radius whose centre is at the vertex of the cone . If a bright point be emitting light , and the quantity of light emitted within a cone of solid angle w be Q , then the mean intensity of emission within the cone is Q / w . When the ...
Page 5
... radius OC describe a spherical surface cutting the cone , and let A ' be the area of the spherical surface enclosed within the cone . Then the solid angle is given by the equation w = A ' / r2 . The small areas A and A ' may be regarded ...
... radius OC describe a spherical surface cutting the cone , and let A ' be the area of the spherical surface enclosed within the cone . Then the solid angle is given by the equation w = A ' / r2 . The small areas A and A ' may be regarded ...
Page 6
... radius is a circle whose radius is sin a . Hence if be the zenith distance of the luminary , the illumination on a small horizontal area is Ι == μπ sin2a cos 0 . 7 * . Objects appear equally bright at all distances . The apparent ...
... radius is a circle whose radius is sin a . Hence if be the zenith distance of the luminary , the illumination on a small horizontal area is Ι == μπ sin2a cos 0 . 7 * . Objects appear equally bright at all distances . The apparent ...
Page 21
... radius r ; take an external point 0 , such that OC = μr , and draw any line OPQ through O to meet the circle in P , Q , and join CP , CQ . Then if we denote the angle CPQ by 4 , and COP by p ' , a P B A or sin sin ' CO : CP = μ : 1 ...
... radius r ; take an external point 0 , such that OC = μr , and draw any line OPQ through O to meet the circle in P , Q , and join CP , CQ . Then if we denote the angle CPQ by 4 , and COP by p ' , a P B A or sin sin ' CO : CP = μ : 1 ...
Page 32
... radius of the vessel , the index of refraction for water being taken to be 2. The concave side of an equiangular spiral being polished , prove that a ray of light once a tangent to the spiral will always be a tangent to the spiral ...
... radius of the vessel , the index of refraction for water being taken to be 2. The concave side of an equiangular spiral being polished , prove that a ray of light once a tangent to the spiral will always be a tangent to the spiral ...
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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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