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absorption amplitude angle angstroms aperture aperture stop astigmatic atoms beam biprism brightness calcite chromatic collimator color components cross hairs crystal curvature diameter difference of path diffraction pattern direction dispersion distance effect electron energy entrance pupil equation exit pupil experiment eyepiece field focal length frequency Fresnel Fresnel biprism fringes given glass illumination illustrated in Fig index of refraction intensity interference interferometer lens lenses light magnification maxima maximum measured metal Michelson micrometer minimum mirror molecules motion nicol object observed obtained optic axis optical system ordinary parallel perpendicular phase plane of incidence plane of vibration plane-polarized plate polarized position principal prism radiation radius rays reflection resolving power result rotation shown in Fig simple harmonic motions slit Snell's law spectra spectral lines spectrometer spectrum spherical aberration substances surface telescope tion transmitted tube velocity wave front wave-length white-light width Wollaston prism Zeeman effect zero