# Dictionary:Obliquity factor

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(∂ blik’ wi tē) A factor derived by Stokes for use with Huygens’ principle to show that the major energy in a wave moves forward and to prevent backward propagation:

${\displaystyle cos{\frac {\phi }{2}}\approx {\frac {1+cos{\phi }}{2}}}$,

where ${\displaystyle \phi }$ is the angle between the directions of reradiation and of approach.