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In Physics / High School | 2014-09-15

2. An optical fibre is 1200 km long and it takes light 0.006 s to travel from one end to the other. Calculate the speed of light in glass.

Asked by Saad

Answer (2)

To calculate the speed of light in glass, we use the formula speed = distance / time . Given that the optical fibre is 1200 km long and it takes light 0.006 seconds to travel from one end to the other, we first convert the distance from kilometers to meters, resulting in 1,200,000 meters (since 1 km = 1000 m).
Next, we calculate the speed using the given time:
Speed = Distance / Time
Speed = 1,200,000 meters / 0.006 seconds
Speed = 200,000,000 meters/second (m/s)
Therefore, the speed of light in the optical fibre (which is made of glass) is 200,000,000 meters/second or 200 million m/s.

Answered by BillDuke | 2024-06-24

The speed of light in glass can be calculated as 200,000,000 meters per second by dividing the distance of 1,200,000 meters by the time of 0.006 seconds. This speed is slower than the speed of light in a vacuum due to the properties of glass. The refractive index of glass reflects this reduced speed compared to light traveling in a vacuum.
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Answered by BillDuke | 2024-10-01

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