The Acceptance Angle in Optical Fiber is found using the following formula: `theta=1/n_0sqrt(n_c^2-n_(cl)^2)`, where:
- `theta` = acceptance angle
- `n_0` = refractive index of medium around core
- `n_c` = refractive index of core
- `n_(cl)` = refractive index of cladding
References
The formula is from RP Photonics Encyclopedia (https://www.rp-photonics.com/acceptance_angle_in_fiber_optics.html).
The definition is from Wikipedia (https://en.wikipedia.org/wiki/Guided_ray).
