Question

which light source used in numerical aperture​

Answer 1

Answer:

The figure below shows an optical fiber inside which light ray is focused. So, the ray XA is launched from denser medium to rarer medium by making an angle α with the fiber axis. This angle α is known as the acceptance angle of the fiber.

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Answer 2

Answer:

Derivation for Numerical Aperture of Optical Fiber

The figure below shows an optical fiber inside which light ray is focused. So, the ray XA is launched from denser medium to rarer medium by making an angle α with the fiber axis. This angle α is known as the acceptance angle of the fiber.