Multiple choice

Why is the source of light not visible through a bent cylindrical tube?

  1. The distance between the eye and the source of light increases.

  2. The light is absorbed by the tube.

  3. The light travels in a straight line.

  4. It is dark inside the tube.

  5. 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.