Elementary Treatise on Natural Philosophy, Parte4D. Appleton, 1878 |
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Términos y frases comunes
æther angle of incidence beam beats body called centre colours concave lens concave mirror conjugate foci convex convex lens corresponding crystal curvature denote density direction displacement distance eclipse elasticity emitted employed equal experiment eye-piece flame focal length fork formula frequency of vibration fundamental note glass harmonics Iceland-spar incident ray index of refraction interval inverted law of sines lens lenses luminous point magnifying medium metres minimum deviation musical node normal number of vibrations object object-glass oblique observer obtained octave optical ordinary parallel particles pass pencil perpendicular pipe pitch placed plane mirror plate polarization portion position principal axis principal focus prism produced propagated rarefaction ratio reflected ray rotation screen seen side slit sonorous spectra spectrum spherical string surface telescope temperature tion tone traversing tube tuning-fork undulation unison velocity of sound vertical vibrations per second wave-length waves Young's modulus
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Página 911 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Página 910 - R' P', SP, will have a constant ratio ; or the sines of the angles of incidence and refraction are in a constant ratio.
Página 959 - B' to infinite distance, F will be the principal focus of both lenses, and the magnification is the ratio of the focal length of the object-glass to that of the eye-piece. If the eye - tube be pushed in as far as is compatible with distinct vision (the eye being close to the...
Página 1018 - The statement that the surface of a liquid at rest is a horizontal plane is sometimes expressed in the form "water finds its own level." It is this property of a liquid which enables water to be supplied to a town. A reservoir is constructed on some elevation which is higher than any part of the district to be supplied. Main pipes starting from the reservoir are laid along...
Página 939 - OA, OB in the required points. An eye placed on the other side of the lens will accordingly see a virtual image erect, magnified, and at a greater distance from the lens than the object. This is the principle of the simple microscope. The formula for the distances D, d of object and image from the lens, when both are on the same side, is Fig.