Fibre optic cables are capable of transmitting light at
- 1.99 * 108 m/s.
- 3.00 * 108 m/s.
- 0.99 * 108 m/s.
Explanation
Light slows in glass fibre because the core has a refractive index around 1.5, giving a speed of roughly the free-space value divided by 1.5, about 1.99 times 10 to the 8 metres per second. The full 3.00 times 10 to the 8 figure applies only to light in a vacuum, not in the fibre.
EgiGol asking:
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Community Comments (1)
G
gmess Posts: 1 23.12.2021 / 18:32
this is writed very bad... the answer is: 3x10^8m/s is the speed of sound on vacuum. The air has a reflective index of 1,5 ... so 3x10^8m/s /1,5 = 2x10^8 (the answer is 1.99x10^8 m/s)
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