Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 31
... results in burning , fusing , and volatilising almost everything on which the solar image falls . Much has not been attempted in this direction , though the modern substitution of silvered glass for metal would render OPTICS WITHOUT ...
... results in burning , fusing , and volatilising almost everything on which the solar image falls . Much has not been attempted in this direction , though the modern substitution of silvered glass for metal would render OPTICS WITHOUT ...
Página 41
... results in a tabular form , merely by converting each common into the corresponding decimal fraction . These can be carried to any required minuteness , and arranged with perfect ease for comparison . Thus for the proportion which is ...
... results in a tabular form , merely by converting each common into the corresponding decimal fraction . These can be carried to any required minuteness , and arranged with perfect ease for comparison . Thus for the proportion which is ...
Página 52
... results : the position , the inversion , the magnitude , and the brightness of the focal images follow the same rule in mirrors and lenses ; but with this great difference , that in reflection the position of P , coinciding with the ...
... results : the position , the inversion , the magnitude , and the brightness of the focal images follow the same rule in mirrors and lenses ; but with this great difference , that in reflection the position of P , coinciding with the ...
Página 54
... result ? Two plano - convex lenses , each half as deep , or strong , that is , having half as much refraction , and therefore about twice the original focal length , which will not be affected by their facing opposite ways . But should ...
... result ? Two plano - convex lenses , each half as deep , or strong , that is , having half as much refraction , and therefore about twice the original focal length , which will not be affected by their facing opposite ways . But should ...
Página 57
... result will follow the strongest , that is , the one which with the same density has the deeper curves , or with the same curves has the greater density . ment . 4. To exhibit the images in conjugate foci ; a very interesting as well as ...
... result will follow the strongest , that is , the one which with the same density has the deeper curves , or with the same curves has the greater density . ment . 4. To exhibit the images in conjugate foci ; a very interesting as well as ...
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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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