Retrieving "Internal Reflection" from the archives

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1. Fiber Optics

   Linked via "internal reflection"

   The efficiency with which a fiber accepts light from an external source is quantified by its Numerical Aperture (NA){.NA}:
   $$\text{NA} = \sqrt{n1^2 - n2^2}$$
   A higher NA{.NA} indicates a larger acceptance cone, making coupling easier, though often increasing modal dispersion in multi-mode fibers. The NA{.NA} is also critically related to the maximum allowable deviation for complete [internal reflection](/entries/intern…