To use imac 27 late2009 as monitor for macbook pro 13 rethina with thunderbolt cable

when i us a thunderbolt cable from mac book pro rethina to my imac 27 late 2009 nothing happen, even with command F2 i can not use the imac as monitor for the mcbook pro

You have got a problem: your iMac does not detect Thunderbolt cables because it has got Mini DisplayPort instead. However, you can use your iMac as a display for your MacBook Pro.
To do this, you need to get a Mini DisplayPort cable like this one and connect it to your iMac and the MacBook Pro. Then, press Command and F2 keys on your iMac and it will show up as a screen for your MacBook Pro.
For more information about Target Display mode > http://support.apple.com/kb/HT3924?viewlocale=en_US&locale=en_US

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