Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 8
... sides in a succession of gradually enfeebled waves . So it is with light ; but with this im- portant difference , that we only perceive the disturbance of the water in a horizontal direc- tion , but the waves of light are propagated in ...
... sides in a succession of gradually enfeebled waves . So it is with light ; but with this im- portant difference , that we only perceive the disturbance of the water in a horizontal direc- tion , but the waves of light are propagated in ...
Página 12
... side by side as a pencil of rays . The point from which the ray starts is called the radiant point , or for brevity the radiant ; and every object that we see emitting light from its whole surface , is con- ceived to be made up of , or ...
... side by side as a pencil of rays . The point from which the ray starts is called the radiant point , or for brevity the radiant ; and every object that we see emitting light from its whole surface , is con- ceived to be made up of , or ...
Página 16
... side of it after reflection . Or , more briefly , the angle of incidence is equal to the angle of re- flection . And these angles are in the same plane . We must mind our spelling , and not write " plain . " The words are akin , but ...
... side of it after reflection . Or , more briefly , the angle of incidence is equal to the angle of re- flection . And these angles are in the same plane . We must mind our spelling , and not write " plain . " The words are akin , but ...
Página 17
... side of it as before . Let me show you all this in three diagrams . In the first , CD is a section or edge- ways view of a plane mirror , which will be hori- zontal if of water , or oil , or mercury , but in any other position would be ...
... side of it as before . Let me show you all this in three diagrams . In the first , CD is a section or edge- ways view of a plane mirror , which will be hori- zontal if of water , or oil , or mercury , but in any other position would be ...
Página 19
... rays are re- flected by the mirror will have as many corre- sponding images apparently on the other side of it , filling up a perfect scene to an C 2 OPTICS WITHOUT MATHEMATICS . 19 make angles among themselves, which cannot be ...
... rays are re- flected by the mirror will have as many corre- sponding images apparently on the other side of it , filling up a perfect scene to an C 2 OPTICS WITHOUT MATHEMATICS . 19 make angles among themselves, which cannot be ...
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Términos y frases comunes
angles of incidence aperture axis beautiful called candle circle cloth boards colour concave lens concave mirror conjugate foci converging convex lens course crossing crystal crystalline lens curious curves dark direction dispersion distance Double Refraction edge equal angles equi-convex eye-lens Fcap feet focal image focal length form an image fraction front happens hole inches larger lenses look looking-glass magnifying power microscope minute moon Newtonian reflector NORTHUMBERLAND AVENUE object object-glass opposite optical parallel rays perfect perfectly picture plane mirror polarised position prism produce PROMOTING CHRISTIAN KNOWLEDGE properties of light proportion radiant radius rainbow ray passes reflected rays reflecting telescopes refraction retina reverse right angles seen shorter focus side sideways sine Sir EDMUND BECKETT spectrum speculum sphere spherical spherical aberration straight line suppose surface telescope thing tion turned undulations violet waves wonderful
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