Turn one the laser by touching the metal plate. Adjust the revolving mirrors marked with an arrow in such a way that the beam hits the target.
What happens to the light beam when it hits a mirror? Compare the angle of the light beam entering the mirror and the angle of the reflecting light beam.
Also try
How many different routes to the target are you able to find? Can you find the shortest route?
Fun facts
A light beam hitting a mirror will be reflected. The angle between the mirror and the entering light beam, equals the angle for the reflecting light beam. The reason way we can see our self in a mirror is that every part of our body reflects light which will hit the mirror, and next will hit our eyes.

Before you leave adjust the mirrors in a random manner.