Can you carry a makeup mirror on a plane?

You can, especially if it's plastic. When you walk through security you can't be wearing anything metal, which would include your make up mirror if it's metal. If it's metal you can put it in your carry on. It's not a liquid and it's not a weapon so I would assume that you could bring it along. If your having it go through checked baggage you have nothing to worry about the mirror would 100% be allowed to go on the plane.