Click This Link!!!50 mW Laser does Eye damage from his friend waving it in his face...
"Yeah you guessed it... At school..:banghead:"-Wear The Proper Goggles for Your Protection-Click Here, Please READ! Above >5mW you can damage Your Eyes with a Reflection in 1/100th of a second.It Doesn't Matter How Dim it "Looks"! It is still dangerous! Above >100 mW you can burn your retina off any glossy surface just Reflecting The Beam off to your Eye!It's More Than Just a Mirror that you need to be Careful Of!!
And remember There is Never A Perfectly Diffused Surface, Do You want to Risk it?!