Paraxial approximation: Difference between revisions

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| accessdate=15 January 2014|year=2007}}</ref>

A '''paraxial ray''' is a [[Ray (optics)|ray]] which makes a small angle (''θ=1,2,3,4,5)'' to the [[optical axis]] of the system, and lies close to the axis throughout the system.<ref name=Greivenkamp/> Generally, this allows three important approximations (for ''θ'' in degreeradian) for calculation of the ray's path, namely:<ref name=Greivenkamp/>

:<math>