Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 27
... learned . In place of our imaginary shining pin's head , we will have a lighted taper , and darken the room sufficiently : A C a then every point in our taper and its flame being a radiant will have its conjugate focus , and the ...
... learned . In place of our imaginary shining pin's head , we will have a lighted taper , and darken the room sufficiently : A C a then every point in our taper and its flame being a radiant will have its conjugate focus , and the ...
Página 34
... the existence of man . We now proceed to another of the principal properties of light We must Refraction . - leave Reflection for the present as completely behind as if we had never learned it , and 34 OPTICS WITHOUT MATHEMATICS .
... the existence of man . We now proceed to another of the principal properties of light We must Refraction . - leave Reflection for the present as completely behind as if we had never learned it , and 34 OPTICS WITHOUT MATHEMATICS .
Página 35
Thomas William Webb. behind as if we had never learned it , and apply ourselves to a new rule and fresh phænomena . Light may not only be turned back , as we have seen , from a polished surface without entering , as in ... learned it, and ...
Thomas William Webb. behind as if we had never learned it , and apply ourselves to a new rule and fresh phænomena . Light may not only be turned back , as we have seen , from a polished surface without entering , as in ... learned it, and ...
Página 62
... learned , in Problem 3 , how you might reduce the divergency by the use of a convex lens . Now you can bring your knowledge into action . Place a suitable lens in front of the eye , and you will reduce the diver- gency till the object ...
... learned , in Problem 3 , how you might reduce the divergency by the use of a convex lens . Now you can bring your knowledge into action . Place a suitable lens in front of the eye , and you will reduce the diver- gency till the object ...
Página 68
... learned that the magnitude of the focal image is in proportion to its distance from the lens : the image therefore formed by a lens of 8 - inch focus will be 16 times larger than that in the eye . But the eye cannot see that image , or ...
... learned that the magnitude of the focal image is in proportion to its distance from the lens : the image therefore formed by a lens of 8 - inch focus will be 16 times larger than that in the eye . But the eye cannot see that image , or ...
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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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