Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 10
... becomes very perceptible . Astronomers have proved that the sun's light takes more than 8 minutes in crossing the 92,000,000 of miles which separate him from the earth ; so that if he were suddenly extinguished we should still see him ...
... becomes very perceptible . Astronomers have proved that the sun's light takes more than 8 minutes in crossing the 92,000,000 of miles which separate him from the earth ; so that if he were suddenly extinguished we should still see him ...
Página 12
... become afterwards diverging . Medium ( me- dia if more than one ) : this is anything that light 1 Not literally always , but the exceptions do not come under our notice at present . passes through ; anything that carries it forward on ...
... become afterwards diverging . Medium ( me- dia if more than one ) : this is anything that light 1 Not literally always , but the exceptions do not come under our notice at present . passes through ; anything that carries it forward on ...
Página 13
... become partially trans- parent . You can try for yourself . If you breathe on a slip of glass , and lay it flat on a fragment of gold leaf so as to take it up , you will see the sun through it of a fine green colour ; or , if you take ...
... become partially trans- parent . You can try for yourself . If you breathe on a slip of glass , and lay it flat on a fragment of gold leaf so as to take it up , you will see the sun through it of a fine green colour ; or , if you take ...
Página 24
... become of its light ? All of it will fall at right angles to the surface ; it will go and come back in P , returning to C again . Now move R a little way from C to- wards the mirror . This must be of course along some radius ; the most ...
... become of its light ? All of it will fall at right angles to the surface ; it will go and come back in P , returning to C again . Now move R a little way from C to- wards the mirror . This must be of course along some radius ; the most ...
Página 40
... become as 3 to 2. I do not know that I can put this more plainly , so if you do not as yet see it , and really wish to under- stand the principle , I must ask you to go over it again and again till you do . You will be sure to master it ...
... become as 3 to 2. I do not know that I can put this more plainly , so if you do not as yet see it , and really wish to under- stand the principle , I must ask you to go over it again and again till you do . You will be sure to master it ...
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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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