There are actually several tools that you can use to mirror your iPad screen to your computer or projector, but from my own expeirence using iPad screen mirroring in my presentations in university, I find AirServer to be the best. I have been using Reflector for a while but I feel more comfortable with using AirServer.
AirServer is a technology that allows you to wirelessly share the screen of your iPad or iPhone on other devices including Mac, PC, and TV. Teachers can use this piece of technology with their students in class to share slides , presentations, and tutorials. AirServer also gives you " the freedom to move around the class with your iPad in hand. AirServer also supports multiple simultaneous connections, so one or more students could mirror their iPads to share their ideas and their work with the rest of the class."
Brief summary of AirServer features :
- Beam your iPad or iPhone screen to HDMI or VGA projector, smartboard or HDTV via a Mac or PC
- True full screen display
- Picture enhancement settings
- Secure password protection
- Collaborate with students using simultaneous connections