Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 13
... blue . And now we must make up our minds to learn a little about Angles . We need not alarm ourselves about them . We are pledged by our title to avoid mathematics as much as possible ; but OPTICS WITHOUT MATHEMATICS . 13.
... blue . And now we must make up our minds to learn a little about Angles . We need not alarm ourselves about them . We are pledged by our title to avoid mathematics as much as possible ; but OPTICS WITHOUT MATHEMATICS . 13.
Página 14
... angle has nothing to do with the length of the lines ; for the longest lines may form the smallest angle . Here are various specimens of angles , the smallest of which is the last but one , because the lines have the least mutual slope ...
... angle has nothing to do with the length of the lines ; for the longest lines may form the smallest angle . Here are various specimens of angles , the smallest of which is the last but one , because the lines have the least mutual slope ...
Página 15
... angle . Angles are named by the letters that de- scribe the lines ; thus the angle formed at C by the lines AC , BC is called the angle ACB or BCA . If two straight lines cut through each other in any way , there will be of course 4 angles ...
... angle . Angles are named by the letters that de- scribe the lines ; thus the angle formed at C by the lines AC , BC is called the angle ACB or BCA . If two straight lines cut through each other in any way , there will be of course 4 angles ...
Página 16
... angle which the incident light makes with P will be equal to the angle which it makes again with P on the other side of it after reflection . Or , more briefly , the angle of incidence is equal to the angle of re- flection . And these ...
... angle which the incident light makes with P will be equal to the angle which it makes again with P on the other side of it after reflection . Or , more briefly , the angle of incidence is equal to the angle of re- flection . And these ...
Página 17
... angles of incidence and reflection will be equal on each side of it as before . Let me show you all this in three diagrams . In the ... angle ; then it will be は C reflected to B , so as to make the angles OPTICS WITHOUT MATHEMATICS . 17.
... angles of incidence and reflection will be equal on each side of it as before . Let me show you all this in three diagrams . In the ... angle ; then it will be は C reflected to B , so as to make the angles OPTICS WITHOUT MATHEMATICS . 17.
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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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