Light Propagation and Refraction in Fibre Optics Exam Questions and Answers Latest Update Graded A+
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Course
Fibre optic
Institution
Fibre Optic
Light Propagation and Refraction in Fibre Optics Exam Questions and Answers Latest Update Graded A+
Speed of light - Answers The speed of light is 300,000 km per second in a vacuum.
Refraction - Answers The change in the direction of a lightwave due to the change in its speed when passing from on...
Light Propagation and Refraction in Fibre Optics Exam Questions and Answers Latest Update Graded
A+
Speed of light - Answers The speed of light is 300,000 km per second in a vacuum.
Refraction - Answers The change in the direction of a lightwave due to the change in its speed when
passing from one medium to another at any angle other than 90° or 0°.
Fibre optics - Answers Refraction occurs when light waves travel from a medium with a given refractive
index to a medium with another, causing a change in direction at the boundary between the media.
Refractive index - Answers A measurement of how fast light travels in a material relative to the speed of
light in vacuum, determining the change in speed based on the refractive index of the mediums and the
angle of incidence.
Snell's Law - Answers The relationship between the different angles of light as it passes from one
transparent medium to another, expressed as Ni * Sin(Ai) = Nr * Sin(Ar), where Ni is the refractive index
of the medium the light is leaving, Ai is the incident angle, Nr is the refractive index of the medium the
light is entering, and Ar is the refractive angle.
Critical angle - Answers The angle at which light bending towards or away from the normal reaches 90 or
-90 degrees, causing total internal reflection when the angle of refraction becomes 90 or -90.
Total Internal Reflection - Answers An optical phenomenon where all light is reflected when a ray of light
strikes a medium boundary at an angle larger than a critical angle with respect to the normal to the
surface.
Core - Answers The central component of a fibre where light is carried, typically made from a silica mix
with added dopants to increase its refractive index.
Cladding - Answers The material surrounding the core of a fibre, made from pure silica with a higher
refractive index than the core and typically 125µm in diameter.
Coatings - Answers UV-cured urethane acrylate composite materials applied to the outside of the fibre
to protect the glass fibre strands during manufacturing, testing, cabling, and installation.
Primary coating - Answers The initial coating on a fibre optic cable, also known as 'buffer' coating,
typically 250µm in diameter.
Secondary coating - Answers The additional coating on a fibre optic cable, usually presented as a pigtail
or in breakout fibre, typically 900µm in diameter.
Silica - Answers The main material used in high-quality fibres, providing physical properties similar to
glass, such as not stretching.
Plastic Clad Silica (PCS) - Answers Early datacomms fibres made from a silica core with plastic cladding,
now replaced by Hard Clad Silica (HCS) for better stability and durability.
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