Numerical Aperture

• Numerical aperture of optical telecommunication fiber
• Numerical aperture in microscopy

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net operation network administration network architecture network engineering network interface network interface device network management network operating system network termination 1 network topology neutral direct current telegraph system	noise noise equivalent power noise figure noise level noise power noise temperature noise weighting noisy black noisy white non fixed access non return to zero	normalized frequency ep telecommunications n entity nuclear hardness nyquist interval off axis optical system off hook office classification off line off the air one way trunk	on hook on premises wiring on the air n user open network architecture open systems architecture open systems interconnection specification operation optical attenuator optical axis optical density