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## Homework Statement

Every 2km power is reduced by half. Initial power = 10watt. What is power after traveled 8km?

C = 3x10

^{8}. What is speed of light passing through optic fibre? n = 1.55

## Homework Equations

P = [tex]\frac{w}{T}[/tex] ?

## The Attempt at a Solution

I don't know where to start

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