Question

You set up an experiment by placing a laser pointer where its light hits the opposite wall in a marked spot. Your friend then sets up an obstacle in the light beam's path and asks you to use mirrors to redirect the beam around the obstacle so it hits the wall in the same place. What is the minimum number of mirrors you could use to do this, assuming the laser pointer must remain still?
three

two

one

four

Answer 1

Answer:

two

.....................

Answer 2

The minimum number of mirrors is 2