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achromatic amplitude angle of incidence atoms bands beam of light bright bright band calcite chromatic aberration circle color cone crown glass crystal curvature curve dark diameter diffraction direction displacement distance electric electromagnetic electrons elliptic emitted energy equal equation ether eyepiece fact figure film focal length focal plane formula fringes glass grating illumination incident light incident wavefronts index of refraction interference latter lens lenses light passes lines magnetic measure medium mirror motion moving number of wavelengths object optic axis parallel perpendicular phase photographic placed plane waves plate position principal focus principal plane prism produced radiation radius Ramsden eyepiece rays reflected light refracted wavefront refractive index represent retina rings rotation secondary wavelets seen shown shows side slit sodium spectra spectroscope spectrum spherical spherical aberration star suppose telescope theory thickness tion ultraviolet velocity of light vibrations violet wavelength X-rays zone
Page 290 - This result followed also from the statement made in § 0O that the electromotive force induced in any circuit is equal to the rate of cutting of lines of force by that circuit. For all of the lines which pass through the core cut all of the coils on s. If, therefore, there are twice as many coils in one case as in another, twice as many lines of force cut the circuit, and hence'the EMF is twice as great. If, then, we wish to develop...
Page 255 - The force that is mutually exerted between two charges varies directly as the product of the charges, and inversely as the square of the distance between them.
Page 82 - In words, the reciprocal of the focal length of a thin-lens combination is equal to the sum of the reciprocals of the focal lengths of the individual lenses.
Page 189 - D represent the difference between the number of heads and the number of tails when a coin is tossed n times.
Page 40 - ... Now suppose that instead of a single blow we strike a series of very rapid equal blows on the water. We now see that a disturbance starts out after each blow, but the speed of the disturbances after they leave the paddle is the same as before. The length of the individual waves in the system, that is, the distance from crest to crest or from trough to trough, will then depend on the rate at which we strike the surface with the paddle. If the wave front moves out ten feet in one second, and we...
Page 220 - Brewster4, with a happy sagacity, discovered the formula to be simply this, that the index of refraction is the tangent of the angle of polarization.
Page 245 - Right-handed screw. to the direction of the current as the direction of rotation of a right-- handed corkscrew bears to the direction in which it advances.
Page 104 - ... the ratio of the angle which the image subtends at the eye to the angle which the object subtends when viewed directly in its actual position.