Multiple choice Why is the source of light not visible through a bent cylindrical tube? The distance between the eye and the source of light increases. The light is absorbed by the tube. The light travels in a straight line. It is dark inside the tube. None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation Yes, light always travels in a straight line. Once the tube is bent at some angle, it is not possible to see the source of light through it. This happens because light travels in a straight line.