Question

Why light source can't be seen through a bent tube

Answer 1

The light source can't be seen through a bent tube because light travels in straight line and here the tube is bent

Answer 2

Because light always travel in straight line.

Let understand it by a example

Take a bend tube and light a candle and hold the tube such that its 1 end is toward the lighted candle and another towards your eyes ,now what

Happen is that, that u can't able to see the rays coming from the

CANDLE. BECAUSE LIGHT ALWAYS

PROPAGATE IN STRAIGHT LINE.