Small-angle approximation: Difference between revisions

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=== Wave Interference ===

The sine and tangent small-angle approximations are used in relation to the [[double-slit experiment]] or a [[diffraction grating]] to simplifydevelop simplified equations like the following, e.g.where 'fringe&nbsp;spacing'&nbsp;={{mvar|y}} 'wavelength'&nbsp;×is the 'distance&nbsp; of a fringe from the center of maximum light intensity, {{mvar|m}} is the order of the fringe, {{mvar|D}} is the distance between the slits toand projection screen'&nbsp;÷, and {{mvar|d}} is the distance between the slits: 'slit&nbsp;separation'.<ref>{{Cite web|url=http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/slits.html|title=Slit Interference}}</ref><math display="block">y \approx \frac{m\lambda D}{d}

</math>

=== Structural mechanics ===