ATIS Telecom Glossary
Sunday, November 23, 2014

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critical angle
In geometric optics, at a refractive boundary, the smallest angle of incidence at which total internal reflection occurs. Note 1: The angle of incidence is measured with respect to the normal at the refractive boundary. Note 2: The critical angle is given by where c is the critical angle, n1 is the refractive index of the less dense medium, and n2 is the refractive index of the denser medium. Note 3: The incident ray is in the denser medium. Note 4: If the incident ray is precisely at the critical angle, the refracted ray is tangent to the boundary at the point of incidence.

equation 06

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
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