Here's how to access the iPhone's hidden mode that turns the camera into a magnifying glass | iPads, MakerEd and More in Education | Scoop.it
From www.businessinsider.com - February 20, 2017 8:24 AM
Apple included a nifty hidden camera mode in the latest version of its iPhone software, iOS 10. 

"Magnifier" mode uses the iPhone's camera to magnify text or other small things — handy, especially, for reading fine print, or zooming in on small details.