Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 6
... suppose , the tick of a watch or an ordinary time - piece ; the beats of a great tall house - clock are the only real seconds , 60 to a minute . Now could you count 100 between each of those slow ticks ? No , nor 10 without a good deal ...
... suppose , the tick of a watch or an ordinary time - piece ; the beats of a great tall house - clock are the only real seconds , 60 to a minute . Now could you count 100 between each of those slow ticks ? No , nor 10 without a good deal ...
Página 7
... suppose 600 with 12 ciphers after it . And like the measure of size , this is an average number ; and if some kinds of light - vibrations are rather slower , others are more rapid still . Are we really expected to admit such mar ...
... suppose 600 with 12 ciphers after it . And like the measure of size , this is an average number ; and if some kinds of light - vibrations are rather slower , others are more rapid still . Are we really expected to admit such mar ...
Página 16
... Suppose a straight line drawn at right angles to the reflecting surface at the point where any ray falls . This we shall call the perpendicular , and for brevity express it by the letter P. Then the angle which the incident light makes ...
... Suppose a straight line drawn at right angles to the reflecting surface at the point where any ray falls . This we shall call the perpendicular , and for brevity express it by the letter P. Then the angle which the incident light makes ...
Página 18
... suppose that the rays come from behind the mirror . But next , if the rays falling on the plane mirror are divergent , their diver- gency will not be altered . For the whole pencil diverging from one radiant , all the rays in it make ...
... suppose that the rays come from behind the mirror . But next , if the rays falling on the plane mirror are divergent , their diver- gency will not be altered . For the whole pencil diverging from one radiant , all the rays in it make ...
Página 50
... suppose one of the sides gradually flattened , till at last when its radius becomes infinite , that is indefinitely great , it may be considered a plane . This will be No. 3 , the plano - convex lens , which is the equi - convex slit in ...
... suppose one of the sides gradually flattened , till at last when its radius becomes infinite , that is indefinitely great , it may be considered a plane . This will be No. 3 , the plano - convex lens , which is the equi - convex slit in ...
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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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