30 feet radius
I see a lot of posts about the 30 feet radius. Some make good points, some, not so much. However, I have to wonder, how many of you have actually paid attention to the movie? Kaylie clearly discovers that radius after she sets the experiment up. And even then, the mirror extends it's grip beyond the 30 feet (like upstairs and outside the house). Which makes me beg the question: is there a number that can be attributed to that radius?
On a different note: besides an unforeseen accident, like the father smashing into it, I don't think there is any way to defeat that mirror. As I see it, that shiny spooky little bastard is like the ultimate super-villain.
Logan: I don't know!
Rogue: You don't know, or you don't care?
Logan: Pick one. X-Men