An Elementary Treatise on Geometrical Optics |
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Page vii
... Illumination of surfaces . 7. Objects appear equally bright at all distances . CHAPTER II . REFLEXION AND REFRACTION OF RAYS OF LIGHT . 8. Reflexion , refraction and scattering of light . 9 . Law of reflexion . 10 . Geometrical ...
... Illumination of surfaces . 7. Objects appear equally bright at all distances . CHAPTER II . REFLEXION AND REFRACTION OF RAYS OF LIGHT . 8. Reflexion , refraction and scattering of light . 9 . Law of reflexion . 10 . Geometrical ...
Page 4
... illuminated surface , then Q / A is called the mean intensity of illumination of the area . When the area of the element of bright surfaces is indefinitely small , the mean intensity of illumination is called the intensity of illumination ...
... illuminated surface , then Q / A is called the mean intensity of illumination of the area . When the area of the element of bright surfaces is indefinitely small , the mean intensity of illumination is called the intensity of illumination ...
Page 5
... illuminated area . 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.
... illuminated area . 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 6
... illuminated area at C , and may be denoted by ; then the illumination due to the small element is μπ By addition we arrive at the following method of determining the illumination of a small area at C due to any finite bright surface ...
... illuminated area at C , and may be denoted by ; then the illumination due to the small element is μπ By addition we arrive at the following method of determining the illumination of a small area at C due to any finite bright surface ...
Page 8
... illuminated by a lamp or candle placed at a given horizontal distance a , show that the height of the flame from the table which will give the greatest possible illumination is equal to a / √2 . 3. If candles of equal brightness be ...
... illuminated by a lamp or candle placed at a given horizontal distance a , show that the height of the flame from the table which will give the greatest possible illumination is equal to a / √2 . 3. If candles of equal brightness be ...
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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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