An optical fibre cable with a core diameter of 1.7 µm operating at a wavelength of 0.8 µm is to be considered for ray theory, has refractive index of the core 1.50 and that of the cladding is 1.47, if a ray of light is incident on the air-core interface at an angle of 49.6ᵒ. Determine: (i) The acceptance cone. (ii) The Numerical Aperture.

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An optical fibre cable with a core diameter of 1.7 µm operating at a wavelength of 0.8 µm is to be considered for ray theory, has refractive index of the core 1.50 and that of the cladding is 1.47, if a ray of light is incident on the air-core interface at an angle of 49.6ᵒ. Determine:

(i) The acceptance cone.
(ii) The Numerical Aperture.

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