Question

Can you see a source of light through a bent tube ?

Answer 1

Yes, if the edge of the rube inside is a good reflecting surface and no if it is a bad reflecting surface. And it also depends on the length of the tube.

I hope it is clear for you.
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Answer 2

We can't able to see the through bend pipe because light always travels straight,it is it's property.

AS LIGHT TRAVELS IN STRAIGHT LINE WHEN THE BEND IS THERE IN A TUBE THE AGAIN DISPERSE BACK