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Waves: Total Internal Reflection and Communication
•Give the meaning of critical angle•Describe internal and total internal reflection•Recall and use the definition of refractive index n in terms of speed •Recall and use the equation sin i /sin r = n •Describe the action of optical fibres particularly in medicine and communications technology
Carry digital signals using electromagnetic waves which travel at the speed of light.
Carry much more information.
Digital hardware is much smaller.
Easier to send over long distances.
DISADVANTAGES
Digital hardware is expensive at the moment.
Although digital signals are unaffected by electrical interference, they don’t give a complete signal [just lots of samples] - some people feel that analogue vinyl records sound better than digital CDs for this reason.
What is noise?Noise is any unwanted
information.Examples of noise are?Electrical storms and random thermal noise.
Which signal is most prone to noise?
AnalogueWhich signal carries the most information?