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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 Hence Iceland-spar incident ray increase index of refraction interval inverted law of sines lens lenses liquid luminous point medium metres metres per second 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 propagation rarefaction ratio reflected ray rotation screen seen 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
Page 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.
Page 910 - SP, will have a constant ratio; or the sines of the angles of incidence and refraction are in a constant ratio. It is often referred to as the law of sines. The angle by which a ray is turned out of its original course in undergoing refraction is called its deviation. It is zero if the incident ray is normal, and always increases with the angle of incidence.
Page 959 - A 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.
Page 917 - As the paper, for convenience of drawing, must be at a distance of about a foot, a concave lens, with a focal length of something less than a foot, is placed close in front of the prism in drawing distant objects. By raising or lowering the prism in its stand (Flo.
Page 790 - ... 10 minutes the liquid should have acquired a violet-brown colour. If much free gelatin is present the colour makes its appearance more slowly, and assumes a pure brown shade, without any violet. Pure gelatin does not produce any colouration until after the lapse of a few hours.