Hi @DJ_Yeo,
The above users are both correct. If you are using lumen, it mimics real-world bounce lighting, and adjusting your materials to mimic this might get some light to show up on your other mesh. However, if you are looking to mimic something like light reflecting off of a mirror, this will not be nearly strong enough nor defined enough.
The laser method is a great solution to this problem. If you are looking for something to fake reflecting light a little more realistically, you could potentially create a similar solution with a chain of spotlights instead of a laser mesh.