Atomic, molecular, and optical physics the origin of the index of refraction treated an electron in an atomic system classically according to the model of Paul Drude and Hendrik Lorentz. The theory was developed to attempt to provide an origin for the wavelength-dependent refractive index "n" of a material. In this model, incident electromagnetic waves forced an electron bound to an atom to oscillate. The amplitude of the oscillation would then have a relationship to the frequency of the incident electromagnetic wave and the resonant frequencies of the oscillator. The superposition of these emitted waves from many oscillators would then lead to a wave which
Some Girls Are Bigger Than Others embrace," while Nick Kent wrote, "'Vicar In a Tutu' and 'Some Girls Are Bigger Than Others', sensibly restrained arrangement-wise, may well be lesser songs but, constructed within their rightful limitations, sound absolutely stunning". In Simon Goddard's track-by-track book "", Johnny Marr describes the song as "a beautiful piece of music", while the author writes, "Possessing one of his most alluring guitar melodies [...] if Marr's tune was heaven-sent, then it seemed very nearly blasphemous of Morrissey to christen it 'Some Girls Are Bigger Than Others' and bestow it with its notoriously frivolous lyric". "Some Girls Are Bigger Than Others" was