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AQA - A Level Physics - Waves #3

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Quiz by Nighthawk
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Last updated: July 8, 2020
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First submittedJuly 8, 2020
Times taken1
Average score27.3%
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Hint
Answer
When entering a material with a higher refractive index the wave speed
decreases.
When entering a material with a higher refractive index the waves refract
Toward the normal
When entering a material with a lower refractive index the wavelength
increases
What is a coherent source of light
Same frequency and constant phase difference
What is material dispersion
The spreading out of pulses/loss of signal quality due to the different speeds at which different wavelengths travel in the core
What is modal dispersion
The spreading out of pulses/loss of signal quality due to the different lengths of paths taken by rays in the optic fibre
Hint
Answer
How do you prevent material dispersion in optic fibres
Use monochromatic light
What remains constant when a wave travels into a different medium
Frequency
The angle of incidence is measured relative to
the normal of the boundary.
What can be done to reduce modal dispersion in optic fibres?
Use a narrow core Use a core and cladding with similar refractive indices Use repeaters to reconstruct the signal along the fibre.
What is the purpose of the cladding on an optic fibre?
To protect the optic fibre from scratches and damage. To prevent the signal from being transmitted into other fibres (cross talk) To provide a large critical angle (and reduce modal dispersion)
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