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Show that, for an optical fibre in air, the numerical aperture ( NA ) is given by (…
PHYSICS · Subjective · A Level · Physics · Waves · Waves
Problem
Show that, for an optical fibre in air, the numerical aperture
NA
\text{NA}
NA
is given by
NA
=
n
core
2
−
n
clad
2
\text{NA}=\sqrt{n_{\text{core}}^{2}-n_{\text{clad}}^{2}}
NA
=
n
core
2
−
n
clad
2
, where
n
core
n_{\text{core}}
n
core
and
n
clad
n_{\text{clad}}
n
clad
are the refractive indices of the core and cladding respectively.
Related theory
Refractive Index
Refraction
Critical Angle
Total Internal Reflection
Refraction and total internal reflection
Optics
Total internal reflection and its applications
Ray Optics and Optical Instruments
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