"The simplest way to see exactly what's on your Apple device's screen is buy Apple's VGA (Dock Connector or Lightning) or HDMI (Dock Connector or Lightning) adapters. Those adapters plug into the connector at the bottom of your device and send out a video signal to the projector or TV at the other end. There's no software to install–it just works when you plug it in. Those adapters sell for between $27 and $45. I want to tell you about iTools because it's a free mirroring solution.
Via John Evans