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air film amplitude angle of incidence aperture blue bright band centre circle circular colour concave convergent convex cornea corresponding crystal curve d₁ determine deviation diffraction direction displacement distance divergent emitted equal equation ether EXPT extraordinary ray eye-piece F₁ film focal length fringes gives rise glass grating illuminated image formed incident ray incident wave internally reflected lens lenses luminous medium mirror motion moving negative Nicol nodal point normal object obtained optic axis ordinary ordinary ray paper parallel particles passing path pencil perpendicular phase plane of incidence plate position principal focus principal plane principal point prism produced radius of curvature reflected ray reflected wave refractive index resultant retina right angles rotated screen second principal seen similar slit spectra spectrum spherical spherical aberration straight line telescope termed thickness tourmaline transmitted vibrations wave front wave plate wave surface wave-length wavelets
Popular passages
Page 237 - ... 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 237 - 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 499 - 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 109 - 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 327 - 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 307 - 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 344 - 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 465 - 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 492 - The laws of specular reflection are: (first law) the reflected ray lies in the same plane as the incident ray and the normal...
Page 109 - A ray of light is refracted through a prism in a plane perpendicular to its edge ; find the deviation produced by refraction.