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aether amplitude angle of incidence axis becomes black-body radiation Bottom calcite called coherent colour crystal dark diffraction pattern dipole direction of motion directions of oscillation distance double refraction electric field electromagnetic waves electron emission equal experiment Faraday effect focal plane front gas-discharge lamp glass grating Huygens hydrogen atom incoming interface interferometer lamp layer length lens light beam light falling light flux light intensity light oscillations light rays light sources light waves magnetic field material measure metal molecules moving number of wavelengths observer obtain optical parallel beam particles path difference perpendicular phase phenomena phenomenon photon plane of incidence plate position prism quantum radiation refractive index screen second mirror shown in figure slit smaller Snell's law sodium solid angle spectral lines spectrum speed of light sphere spherical stilb surface temperature tion totally reflected transmitted vapour violet wavefront wavelength whole number zone