How do optical fibres work?
Light repeatedly undergoes total internal reflection along the fibre.
What is the function of the cladding?
It has a lower refractive index than the core.
What is modal dispersion?
Different light paths cause signals to arrive at different times.
What is material dispersion?
Different wavelengths travel at different speeds in the fibre.
What is pulse broadening?
When a light pulse spreads out during transmission.
Why is pulse broadening a problem?
It causes signal overlap.
What is absorption in optical fibres?
Some light energy is converted to heat, reducing signal strength.”What causes refraction?
What is refractive index?
A measure of how much light slows down in a material compared to a vacuum.
What is the refractive index equation?
n = c / v
What happens when light enters a higher refractive index material?
It slows down and bends toward the normal.
What happens when light enters a lower refractive index material?
It speeds up and bends away from the normal.
What is total internal reflection?
When light reflects completely at a boundary instead of refracting.
What are the conditions for total internal reflection?
Light must travel from higher to lower refractive index and exceed the critical angle.
What is the critical angle equation?
sinθc = n2 / n1
What are optical fibres used for?
Transmitting light signals over long distances.
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Optics - Fundementals18
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Optics - Extended18
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Optics - Final17
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Optics -19
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Optics - 29
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Optics - 39
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Optics - 48
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final15
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Uhh15
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Practical Skills V+S 16
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Practical Skills S+M 17
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Practical Skills S + M 28
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Practical Skills M+S 38
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Practical Skills S + M 412
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Practicals Skills V + S 26
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Qauntum - Def17
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Quantum - Def 27
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Quantum - Def36
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Waves15
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Particles - Atomic Structure and Forces9
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Particles - Decay and Particles9
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Particles - Interaction and Exchange Particles9
