0.5
0.36
0.2
0.27
Answer is Wrong!
Answer is Right!
The numerical aperture (NA) of an optical fiber is a measure of how well the fiber can accept light.
It is defined as the sine of the half-angle of the cone of light that can be accepted by the fiber. The NA is related to the angle of acceptance, $\theta$, by the equation$$NA = \sin \theta$$
In this case, the angle of acceptance is 16 degrees, so the numerical aperture is
$$NA = \sin 16^\circ = 0.27$$
Therefore, the correct answer is $\boxed{\text{D}}$.
The other options are incorrect because they do not correspond to the given angle of acceptance.