How to Mirror from Mac to Apple TV. Two Parts: Using Apple AirPlay Enabling TV Sound Community Q&A. This wikiHow teaches you how to view your Mac's screen on your Apple TV by using AirPlay. AirPlay requires a Mac built in 2011 or later, running on Mountain Lion (OS X 10.8) or later, with a second generation Apple TV or higher connected to a TV set. read more
Click on Mirror Built-In Display to mirror your Mac's native resolution on your TV. Click on Mirror Apple TV to resize your Mac's resolution to match the resolution of your TV. Click on Use as Separate Display to have your Mac extend your desktop and treat your TV as an additional display. read more
Then select Mirror Built-in Display to match the size of your desktop or Mirror Apple TV to match the size of your TV. AirPlay also lets you use your TV as a separate display for your Mac. Just click . in the menu bar, then select Use As Separate Display. read more