2009 iMac display input

is there way how use 27" late-2009 imac external display 2011 macbook air?

adapter should use?

 

using 27-inch imac (late 2009 or mid 2010) external display

 

Forums Macs Desktops iMac

• iPhone
• Mac OS & System Software
• iPad
• Apple Watch
• Notebooks
• iTunes
• Apple ID
• iCloud
• Desktop Computers
• Apple Music
• Professional Applications
• iPod
• iWork
• Apple TV
• iLife
• Wireless