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THE VELOCITY OF LIGHT
REFLECTION AND REFRACTION BY HUYGENS PRIN
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amplitude analyzer angstrom angular aperture atom Balmer series band bright fringe collimating lens corresponding crown glass crystal curvature diagram difference in phase diffraction direction dispersion displacement distance disturbance double slit electric electromagnetic electron emergent emitted energy equal ether example eyepiece face film focal length focal plane given glass grating half-period elements hydrogen incident index of refraction intensity interference fringes lenses luminous maximum measured medium method microscope mirror monochromatic light motion narrow Newton's Rings Nicol prism normal object observed obtained optic axis orbit parallel rays particle path difference perpendicular phase difference piece placed plane waves plate Polaroid position principal plane problem quantum quartz radiation radius rectilinear propagation reflected relation represented resolving power resultant amplitude right angles rotation screen sodium spectral line spectrometer spectrum spherical surface telescope thickness thin tion transmitted tube vibration plane wave-front wavelength wavelet width Zeeman effect