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amplitude angle aperture appear axis bands becomes blue body bright centre circle circular colour Consequently corresponding crystal curvature curve dark described determine deviation direction displacement distance draw edge effect elastic element energy equal equation ether experiment face focal length focus follows formed fringes front given gives glass grating greater half illuminated incident increase latter lens lenses less light means measured medium mirror motion moving negative normal object observed obtained opposite optic ordinary parallel particles passing path pencil period perpendicular phase placed plane plate polarised position possess principal prism produced proved radius rays reflected reflected ray refracted refractive index represent respectively resultant rings rotated screen seen shows side similar slit spectrum spherical straight line suppose surface telescope termed thickness transmitted velocity vibrations viewed wave wave-length wavelets
Page 235 - ... and are not these vibrations propagated from the point of incidence to great distances ? And do they not overtake the rays of light, and by overtaking them successively, do they not put them into the fits of easy reflexion and easy transmission described above ? For if the rays endeavour.
Page 235 - And in like manner, when a ray of light falls upon the surface of any pellucid body, and is there refracted or reflected, may not waves of vibrations, or tremors, be thereby excited in the refracting or reflecting medium at the point of incidence and...
Page 497 - Law If a plane polarized beam of light is allowed to fall on a polarizer, the intensity of the transmitted beam is proportional to the square of the cosine of the angle between the plane of polarization of the incident light and the plane of polarization that would be required for total transmission of the beam. Malus...
Page 107 - Given a prism of a substance of known index of refraction, show how to calculate the deviation produced by it under any given circumstances, especially when the ray goes through the prism symmetrically. Given...
Page 325 - Argand lamp, from incandescent platinum, and even from non-luminous heated brass, through slices of tourmaline cut parallel to the axis of the crystal, a portion of the heat is polarized, when the axes of the crystals are at right angles to each other ; and these results were confirmed by M. Melloni. But Professor Forbes did not allow the polarization of heat to rest solely upon the results obtained with tourmaline. By employing bundles of plates of...
Page 305 - According to the wave theory of light, the index of refraction of a medium is equal to the ratio of the velocity of light in vacuum to that in the medium.
Page 342 - For if this hole be an inch or two long and but a tenth or twentieth part of an inch broad or narrower, the light of the image will be as simple as before, or simpler, and the image will become much broader and therefore more fit to have experiments tried in its light than before.
Page 463 - On now replacing the eyepiece by a camera, we are in position to photograph the spectrum with the greatest ease. We put in the sensitive plate, either wet or dry, and move to the part we wish to photograph. Having exposed for that part, we move to another position and expose once more. We have no thought for the focus, for that remains perfect, but simply refer to the table giving the proper exposure for that portion of the spectrum, and so have a perfect plate. Thus we can photograph the whole spectrum...
Page 490 - The laws of specular reflection are: (first law) the reflected ray lies in the same plane as the incident ray and the normal...
Page 107 - A ray of light is refracted through a prism in a plane perpendicular to its edge ; find the deviation produced by refraction.