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Light is propagated radially very much after the manner of Sound
The propagation of Sound
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angle of incidence aperture axis beams bright bands centre colors compute consider corresponding dark bands difference of path diffraction direction distance edge effect elastic equal exactly experiments explain exterior fringes fluid formula Fresnel fringes produced geometrical shadow glass grating heat heliostat homogeneous light Huygens hypothesis inch inflected instance intensity interval length light-waves luminiferous ether luminous point maxima and minima measured medium mirror motion Newton observed opaque body optics ordinary ray parallel pencils of light perpendicular phenomena placed plane polarized at right portion position prism propagated proportion radiation ratio rays of light reflection refraction refractive index resultant right angles rock salt screen secondary waves seen selenite side sine slit space spectra spectrum speed speed of light straight line suppose surface telescope theodolite theory thickness Thomas Young tion trains of waves transmitted transparent body traversed undulation velocity vibrations wave AC wave-length width