An Introduction to the Theory of OpticsE. Arnold, 1904 - 340 من الصفحات |
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الصفحة 22
... depends on the wave - length , there must always be a change of type when waves which are not of the simple cosine or sine shape are propagated . 11. Waves travelling along a stretched string . Let us now consider the kinetics of wave ...
... depends on the wave - length , there must always be a change of type when waves which are not of the simple cosine or sine shape are propagated . 11. Waves travelling along a stretched string . Let us now consider the kinetics of wave ...
الصفحة 27
... depends therefore on the resistance to distortion , as well as on the resistance to compression . The waves which involve longitudinal displacements only , are called condensational waves , because they involve changes of volume , but ...
... depends therefore on the resistance to distortion , as well as on the resistance to compression . The waves which involve longitudinal displacements only , are called condensational waves , because they involve changes of volume , but ...
الصفحة 32
... depends on the relation between velocities and displacements . The same result has already been proved in Art . 11 . The propagation of waves not necessarily plane or spherical may be treated in the same manner . As long as we know that ...
... depends on the relation between velocities and displacements . The same result has already been proved in Art . 11 . The propagation of waves not necessarily plane or spherical may be treated in the same manner . As long as we know that ...
الصفحة 33
... depends on the relation between velocities and displacements . The same result has already been proved in Art . 11 . The propagation of waves not necessarily plane or spherical may be treated in the same manner . As long as we know that ...
... depends on the relation between velocities and displacements . The same result has already been proved in Art . 11 . The propagation of waves not necessarily plane or spherical may be treated in the same manner . As long as we know that ...
الصفحة 34
... depend on the previous history of the wave , and might be plane , spherical or of irregular shape . In all media whether crystalline or isotropic the wave - surface is characteristic of the medium , while the wave - front in general is ...
... depend on the previous history of the wave , and might be plane , spherical or of irregular shape . In all media whether crystalline or isotropic the wave - surface is characteristic of the medium , while the wave - front in general is ...
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
achromatic achromatic lines æther amplitude aperture axis bands beam centre circle coincident colour constant cos² curves difference in phase diffraction direction of vibration displacement disturbance double refraction effect elastic ellipse ellipsoid equal equation force Fresnel's grating Hence incident light intensity interference intersection isochromatic lines isochromatic surface lens maximum medium n₁ Newton's rings observed obtain optic axes optical distance optical length oscillations parallel particle periodic motion phase difference plane of incidence plane of polarization plane wave plate portion position prism radius ray velocities reflected reflexion refractive index represents resolving power resultant right angles rings screen sin² slit spectrum theory transmitted uniaxal crystals v₁² vector wave normal wave plate wave propagation wave velocities wave-front wave-length wave-surface width zero zones
مقاطع مشهورة
الصفحة 106 - ... might be constructed without an object-glass, if only there were no limit to the admissible focal length. This last proviso, however, as we shall see, takes away almost all practical importance from the proposition. "To get an idea of the magnitudes of the quantities involved, let us take the case of an aperture of 1/5 inch (inch = 2.
الصفحة 184 - If, however, this were not the case, we are so perfectly ignorant of the mode of action of the elements of the luminiferous ether on each other, that it would seem a safer method to take some general physical principle as the basis of our reasoning, rather than assume certain modes of action...
الصفحة 107 - Seen from a distance less than / it will appear magnified. Inasmuch as the arrangement affords a view of the sun with full definition and with an increased apparent magnitude, the name of a telescope can hardly be denied to it. "As the minimum focal length increases with the square of the aperture, a quite impracticable distance would be required to rival the resolving-power of a modern telescope. Even for an aperture of four inches /i would be five miles.
الصفحة 246 - No theory of evolution can be formed to account for the similarity of molecules, for evolution necessarily implies continuous change, and the molecule is incapable of growth or decay, of generation or destruction. None of the processes...
الصفحة 48 - ... nearly equal angles from the apertures at all distances, and wider also in the same proportion as the apertures are closer to each other. The middle ... is always light, and the bright stripes on each side are at such distances, that the light coming to them from one of the apertures must have passed through a longer space than that which comes from the other by an interval which is equal to the breadth of one, two, three or more of the supposed undulations...
الصفحة 48 - In order that the effects of two portions of light may be thus combined, it is necessary that they be derived from the same origin, and that they arrive at the same point by different paths, in directions not much deviating from each other.
الصفحة 184 - Light those formulas which represent the motions of a system of molecules acting on each other by mutually attractive and repulsive forces ; supposing always that in the mutual action of any two particles, the particles may be regarded as points animated by forces directed along the right line which joins- them. This last supposition, if applied to those compound particles, at least, which are separable by mechanical division, seems rather restrictive ; as many phenomena, those of crystallization...
الصفحة 106 - The image of the sun thrown on a screen at a distance exceeding 66 feet, through a hole ^ inch in diameter, is therefore at least as well defined as that seen direct. In practice it would be better defined, as the direct image is far from perfect. If the image on the screen be regarded from a distance /1( it will appear of its natural angular magnitude.
الصفحة 184 - of the advantages of this method, of great importance, is that we are " necessarily led by the mere process of the calculation, and with little care "on our part, to all the equations and conditions which are requisite and "sufficient for the complete solution of any problem to which it may be "applied.