Question

Qué 1 How difference help in the light travel .
Qué 2 How medium is important light propagation​

Answer 1

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1. How difference help in the light travel?

2. How medium is important in light propagation?

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$\implies$A Medium for the Propagation of Light Revisited. Electromagnetic waves are waves that propagate through the vacuum of space. Although it is well known that mechanical waves require the presence of a medium for wave propagation, it is commonly thought that electromagnetic waves do not require a medium for propagation.

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Answer 2

1. The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In miles per hour, light speed is, well, a lot: about 670,616,629 mph. If you could travel at the speed of light, you could go around the Earth 7.5 times in one second.
2. Medium for the Propagation of Light Revisited. Electromagnetic waves are waves that propagate through the vacuum of space. Although it is well known that mechanical waves require the presence of a medium for wave propagation, it is commonly thought that electromagnetic waves do not require a medium for propagation.