Thanks Chimp. I kind of knew what to do, but I didn't know how to end it.
10 isn't too hard. What you do is use a mirror at the top to direct the laser to the right, around all the walls. Then use the other mirrors to direct the laser between the walls to hit the other two lights. After the second one, use a refreactor to send the laser into the left area, and then just use a splitter to hit the last two lights.