Because only the iPhone 4S and iPad 2+ support AirPlay Mirroring.
There are ways to do it with apps for jailbroken iOS devices, though you're likely to get a lesser quality. You might want to have a look at this one for example, made by a former colleague: http://www.plutinosoft.com/idemo
There are ways to do it with apps for jailbroken iOS devices, though you're likely to get a lesser quality. You might want to have a look at this one for example, made by a former colleague: http://www.plutinosoft.com/idemo