Question

Numerical Aperture (NA) of an optical fiber is given by

• A. Core indices and wavelength
• B. Core and cladding indices
• C. Refractive index of air and core
• D. Wavelength and frequency

Hint:

For an optical fiber, \[ \boxed{ NA=\sqrt{n_1^2-n_2^2} } \] where \(n_1>n_2\).

Answer 1

The Correct Option is B

Step 1: Recall the expression for numerical aperture. For a step-index optical fiber, \[ \boxed{ NA=\sqrt{n_1^2-n_2^2}, } \] where - \(n_1\) = refractive index of the core, - \(n_2\) = refractive index of the cladding.

Step 2: Identify the required quantities. Since the numerical aperture depends on the refractive indices of the core and cladding, \[ \boxed{\text{Core and cladding indices}} \] is the correct answer. Therefore, \[ \boxed{(B)} \] is the correct answer.