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Numerical Aperture of Optical Fiber
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 1) What is the working principle behind optical fibers? Reflection Refraction Total internal reflection Diffraction

 2) Total internal reflection occurs only when the angle of incidence is: Independent of critical angle. Equal to critical angle. Lower than critical angle. Greater than critical angle.

 3) The Sine of the angle of incidence divided by the sine of angle of refraction equals optical density is called? Newton’s law Snell’s law Pascal’s law Bernoulli’s law

 4) Optical fibers are often used in preference to copper wire when transmitting data. Which of the following is not a reason for the preferred use of optical fibers? Optical fibers are more durable than copper wires. Optical fibers can carry more information than copper wires. Optical fibers are cheaper than copper wires. optical fibers are better conductors of electricity than copper wires.

 5) In refraction, when ray goes from air to glass at an angle of incidence, which one of these happens? The ray is absorbed. The angle of incidence is greater than angle of refraction. The angle of incidence is less than the angle of refraction. All the ray is reflected off the surface.

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