Figure 11 shows a light signal entering into an optica cladding Core light source 6.0 km Figure 11 A pulse of light is emitted by switching on the source for 1.0 µs. The light is emitted in many directions as shown. The critical angle at the core/cladding boundary is 59° and the length of the fibre is 6.0 km. The refractive index of the core is 1.50. (i) State two advantages that optical fibres have over copper cabies in telecommunication. (ii) Some light from the source will travel straight down the fibre for its entire length. Determine how long it takes to travel the entire length of the fibre. (iii) What is the refractive index of the cladding? er
Figure 11 shows a light signal entering into an optica cladding Core light source 6.0 km Figure 11 A pulse of light is emitted by switching on the source for 1.0 µs. The light is emitted in many directions as shown. The critical angle at the core/cladding boundary is 59° and the length of the fibre is 6.0 km. The refractive index of the core is 1.50. (i) State two advantages that optical fibres have over copper cabies in telecommunication. (ii) Some light from the source will travel straight down the fibre for its entire length. Determine how long it takes to travel the entire length of the fibre. (iii) What is the refractive index of the cladding? er
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Answer a(i), (ii) & (iii) with detailed explanations
Transcribed Image Text:(a) Figure 11 shows a light signal entering into an optical fibre.
cladding
Core
light
source
6.0 km
Figure 11
A pulse of light is emitted by switching on the source for 1.0 µs. The light is emitted in many
directions as shown. The critical angle at the core/cladding boundary is 59° and the length of the
fibre is 6.0 km. The refractive index of the core is 1.50.
(i) State two advantages that optical fibres have over copper cables in telecommunication.
(ii) Some light from the source will travel straight down the fibre for its entire length.
Determine how long it takes to travel the entire length of the fibre.
(iii) What is the refractive index of the cladding?
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