> On the other hand, every mirror would be a great chance to lose your other eye as well, so maybe disregard my ideas.
At those power levels? Probably every surface in general. A beam powerful enough to light a match or burn through a balloon is powerful enough for the diffuse reflection off a table or wall to blind you.
At those power levels? Probably every surface in general. A beam powerful enough to light a match or burn through a balloon is powerful enough for the diffuse reflection off a table or wall to blind you.