Is there any way of using my 24"iMac as a display for my Macbook pro, if so what lead do i need?

I have an old 24" iMac

Model Name: iMac
Model Identifier: iMac6,1
Processor Name: Intel Core 2 Duo

It works fine if not a little slow but I have recently bought an new 15" Macbook Pro and wanted to know if I could use the old imac as the display, and if so what lead I would need. I have been reading forums and it doesn't look good but I'm hoping someone can give me a definitive answer.

Mac

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