80° The figure above shows a cross-section of an optical fibre used in telecommunication. (a.) State and explain two reasons why optical fibres are preferable to copper cables for this purpose. (b.) State the principle on which optical fibres operate and state the conditions under which this principle is satisfied. (c.) How are the conditions stated above made satisfied in the manufacture of optical fibres?
80° The figure above shows a cross-section of an optical fibre used in telecommunication. (a.) State and explain two reasons why optical fibres are preferable to copper cables for this purpose. (b.) State the principle on which optical fibres operate and state the conditions under which this principle is satisfied. (c.) How are the conditions stated above made satisfied in the manufacture of optical fibres?
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Answer (a), (b), & (c)
Transcribed Image Text:80°
The figure above shows a cross-section of an optical fibre used in telecommunication.
(a.) State and explain two reasons why optical fibres are preferable to copper cables for this
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(b.) State the principle on which optical fibres operate and state the conditions under which this
principle is satisfied.
(c.) How are the conditions stated above made satisfied in the manufacture of o ptical fibres?
(d.) The speed of light in the core is 1.95 × 108ms-1 while the smallest angle of incidence in the
core is 80°.
(i.) Explain the significance of the statement "smallest angle of incidence in the core is 80°".
(ii.) Calculate the refractive index of the core and that of the cladding.
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