Extend iPad display to iMac monitor
My mom has an iPad Air (4th Generation) and an iMac (20 inch, mid 2007, OS X Yosemite).
What cable(s) does she need to either extend or mirror her display from her iPad to her iMac?
Thank you!
iPad Pro is not currently capable of offering an “extended desktop” experience - such as that to which you may be accustomed on other computing platforms. The new Sidecar feature provides limited scope to use iPad as Second screen from Mac - but not the other way around.
Your iPad can drive an external display using AirPlay - or via HDMI (and appropriate adapter where needed) - but neither can re-scale the iPad output to match the native resolution of an attached monitor.
There are some iPad Apps in the App Store that provide some external connectivity options for PC and Mac (such as Duet and Duet Pro). These can be expensive - and have mixed reviews.
Here is a third-party comparison of some of the options - including a detailed look at SideCar.
https://thesweetsetup.com/apps/best-app-for-using-an-ipad-as-an-external-display/
I hope this proves to helpful in guiding you to some of the available solutions.