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Reference.org
Eikonal approximation
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<p>In <a href="/facts/Theoretical_physics/Cs2Y12rQ">theoretical physics</a>, the eikonal approximation is an approximative method useful in wave <a href="/facts/Scattering/nMou7lEH">scattering</a> equations, which occur in <a href="/facts/Optics/p0vq4S1T">optics</a>, <a href="/facts/Seismology/Lony1LYX">seismology</a>, <a href="/facts/Quantum_mechanics/BRc3Mzgr">quantum mechanics</a>, <a href="/facts/Quantum_electrodynamics/zPteAr6G">quantum electrodynamics</a>, and <a href="/facts/Scattering_amplitude/TmdeAs1o">partial wave expansion</a>. </p>