Physical OpticsLongmans, Green, and Company, 1883 - 434 |
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Inne wydania - Wyświetl wszystko
Kluczowe wyrazy i wyrażenia
amplitude angle of incidence aperture axes beam bi-prism bright band centre circle coincide colours concave lens consider convex lens cross wire crystal curve dark bands deviation difference of phase diffraction direction of vibration displacement distance disturbance effect ellipse emergent equal ether eye-piece focal length focal lines focus formed Fresnel's glass half-period elements incident light incident wave intensity lenses Let us suppose M₁ maximum brightness medium mirror motion move Nicol optic axis ordinary ray P₁ parallel particle pass path pencil perpendicular plane of incidence plane of polarisation plane polarised plane polarised light plate polarised light position principal plane prism produced reflexion refracted rays refracted wave refractive index right angles rotation screen seen slit source of light spectrum telescope thickness tion travelling velocity wave front wave surface wave-length
Popularne fragmenty
Strona 415 - ... disturbance is propagated through it, which can be calculated from electromagnetic experiments, and also observed directly in the case of light. If it should be found that the velocity of propagation of electromagnetic disturbances is the same as the velocity of light, and this not only in air, but in other transparent media, we shall have strong reasons for believing that light is an electromagnetic phenomenon, and the combination of the optical with the electrical evidence will produce a conviction...
Strona 414 - ... has independently suggested the idea of a medium, and if the properties which must be attributed to the medium in order to account for electromagnetic phenomena are of the same kind as those which, we attribute to the luminiferous medium in order to account for the phenomena of light, the evidence for the physical existence of the medium will be considerably strengthened.
Strona 260 - I conclude further, that the dark lines of the solar spectrum which are not evoked by the atmosphere of the earth, exist in consequence of the presence, in the incandescent atmosphere of the sun, of those substances which in the spectrum of a flame produce bright lines at the same place.
Strona 258 - ... the following : Vapour of sodium must possess by its molecular structure a tendency to vibrate in the periods corresponding to the degree of refrangibility of the double line D. Hence the presence of sodium in a source of light, must tend to originate light of that quality.
Strona 3 - The total energy of any body or system of bodies is a quantity which can neither be increased nor diminished by any mutual action of such bodies, though it may be transformed into any one of the forms of which energy is susceptible.
Strona 259 - Fraunhofer had remarked that in the spectrum of the flame of a candle there appear two bright lines, which coincide with the two dark lines D of the solar spectrum. The same bright lines are obtained of greater intensity from a flame into which some common salt is put. I formed a solar spectrum by projection, and allowed the solar rays concerned, before they fell on the slit, to pass through a powerful salt-flame. If the sunlight were sufficiently reduced, there appeared in place of the two dark...
Strona 260 - A, a, B; these lines point to the existence of potassium in the sun's atmosphere. From my observation, according to which no dark line in the solar spectrum answers to the red line of lithium, it would follow with probability that in the atmosphere of the sun lithium is either absent, or is present in comparatively small quantity.
Strona 258 - ... itself ie to absorb and to have its temperature raised by light from the source of the precise quality in question. In the atmosphere around the sun, therefore, there must be present vapour of sodium, which, according to the mechanical explanation thus suggested, being particularly...
Strona 259 - The same bright lines are obtained of greater intensity from a flame into which some common salt is put. I formed a solar spectrum by projection, and allowed the solar rays concerned, before they fell on the slit, to pass through a powerful salt-flame. If the sunlight were sufficiently reduced, there appeared in place of the two dark lines D two bright lines; if, on the other hand, its intensity surpassed a certain limit, the two dark lines D showed themselves in much greater distinctness than without...
Strona 259 - The spectrum of the Drummond light contains, as a general rule, the two bright lines of sodium, if the luminous spot of the cylinder of lime has not long been exposed to the white heat ; if the cylinder remains unmoved these lines become weaker, and finally vanish altogether. If they have vanished, or only faintly appear, an alcohol flame into which salt has been put, and which is placed between the cylinder of lime and the slit, causes two dark lines of remarkable sharpness and fineness, which in...