Waves which carry energy from one place to another without transferring matter
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What phenomena suggests EM waves are transverse?
Polarisation of EM waves
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When are two wave sources coherent?
When they have the same wavelength and frequency and a fixed phase difference between them
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With what path differences do constructive and destructive interference occur?
Constructive: nλ. Destructive: (n+1/2)λ. n is an integer.
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What is a stationary wave?
Superposition of two progressive waves with same frequency moving through each other in opposite directions.
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When does the most diffraction occur?
When gap size is same as wavelength
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What sort of pattern does white light diffracted through a single slit create?
Central white maximum surrounded by alternating dark patches (minima) and spectra (maxima), with violet on the side closer to the central maximum and red on the side further from it.
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What happens to a diffraction pattern if you increase slit width?
Central maximum gets narrower, its intensity higher.
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What happens to a diffraction pattern if you increase wavelength?
Central maximum gets wider, its intensity lower.
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Why do more slits make an interference pattern sharper?
There are more beams reinforcing the patterns.
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What does white light's interference pattern look like?
Thin white central maximum, surrounded by dark patches (minima) and spectra (maxima), where red is on outermost side and violet on innermost side.
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What are the equations for refraction?
n=C/Cs, 1n2=C1/C2=n1/n2
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What is modal dispersion?
When light rays take different paths down an optical fibre and reach the end at different times
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What is material dispersion?
When light rays of different wavelengths travel down an optical fibre in different times
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What does dispersion do to the pulse?
Broadens it
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What does an optical fibre repeater do?
It boosts and regenerates the signal every so often?
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What is cladding for?
To prevent loss of light from an optical fibre (through scratches, for example)
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Other cards in this set
Card 2
Front
What phenomena suggests EM waves are transverse?
Back
Polarisation of EM waves
Card 3
Front
When are two wave sources coherent?
Back
Card 4
Front
With what path differences do constructive and destructive interference occur?
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