An Elementary Treatise on Geometrical Optics |
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Page 33
... foci and is continually reflected between the curves . after 2n − 1 reflexions , it returns to the point P , the length of the path is equal to n times the difference of the major axes . - If , 13. A cylindrical pencil of light is ...
... foci and is continually reflected between the curves . after 2n − 1 reflexions , it returns to the point P , the length of the path is equal to n times the difference of the major axes . - If , 13. A cylindrical pencil of light is ...
Page 35
... foci of the incident and reflected pencils lie on the same perpendicular to the mirror , at equal distances from it , on opposite sides . 28. A bright point being placed between two parallel plane mirrors , required to find the foci of ...
... foci of the incident and reflected pencils lie on the same perpendicular to the mirror , at equal distances from it , on opposite sides . 28. A bright point being placed between two parallel plane mirrors , required to find the foci of ...
Page 36
... foci of reflected rays . Let OA , OB be the sections of the mirrors by a plane drawn through the radiant point Q perpendicular to both 9 " a q , mirrors ; and let a perpendicular be drawn from Q to the mirror OA and produced to q ' , so ...
... foci of reflected rays . Let OA , OB be the sections of the mirrors by a plane drawn through the radiant point Q perpendicular to both 9 " a q , mirrors ; and let a perpendicular be drawn from Q to the mirror OA and produced to q ' , so ...
Page 37
... foci lie on the circumference of a circle whose centre is 0 , and radius OQ . To determine the positions of the foci , let the arc QA = 0 , QB = 0 ' and AB = 0 + 0 ′ = v . Then the arc Qq = 2QA = 20 , Qq " = BQ + Bq = Qq + 2BQ = 20 + 20 ...
... foci lie on the circumference of a circle whose centre is 0 , and radius OQ . To determine the positions of the foci , let the arc QA = 0 , QB = 0 ' and AB = 0 + 0 ′ = v . Then the arc Qq = 2QA = 20 , Qq " = BQ + Bq = Qq + 2BQ = 20 + 20 ...
Page 38
... foci is 2π / . This theory contains the principle of the kaleidoscope . 30. A kaleidoscope is made in the form of a cylinder , with slips of mirror inside , arranged so that they form two faces of the equilateral prism inscribed in the ...
... foci is 2π / . This theory contains the principle of the kaleidoscope . 30. A kaleidoscope is made in the form of a cylinder , with slips of mirror inside , arranged so that they form two faces of the equilateral prism inscribed in the ...
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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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