Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 12
... surface , is con- ceived to be made up of , or to contain , an infinite number of radiants . Rays are either parallel , diverging , or converging . Parallel rays keep always the same distance apart , and never meet either way ...
... surface , is con- ceived to be made up of , or to contain , an infinite number of radiants . Rays are either parallel , diverging , or converging . Parallel rays keep always the same distance apart , and never meet either way ...
Página 15
... surface . When a ray of light meets such a surface , or in optical OPTICS WITHOUT MATHEMATICS . 15.
... surface . When a ray of light meets such a surface , or in optical OPTICS WITHOUT MATHEMATICS . 15.
Página 16
... surface , will be turned back . Even if the surface should be that of a transparent medium1 , this reflection will take place . And it follows an invariable rule . Suppose a straight line drawn at right angles to the reflecting surface ...
... surface , will be turned back . Even if the surface should be that of a transparent medium1 , this reflection will take place . And it follows an invariable rule . Suppose a straight line drawn at right angles to the reflecting surface ...
Página 17
... surface should not be plane , but concave or hollow like a cup , or convex , that is , rounding , what will happen then ? The same law will hold good . An ex- cessively short portion of a curved line may be considered straight for ...
... surface should not be plane , but concave or hollow like a cup , or convex , that is , rounding , what will happen then ? The same law will hold good . An ex- cessively short portion of a curved line may be considered straight for ...
Página 22
... surface , any want of truth in which displaces the reflected rays irregularly , and distorts the images . Such a fault is readily detected by looking along it as obliquely as possible , when the increase of the angles renders an error ...
... surface , any want of truth in which displaces the reflected rays irregularly , and distorts the images . Such a fault is readily detected by looking along it as obliquely as possible , when the increase of the angles renders an error ...
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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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