On the back of the iPhone 11 Pro can be found three cameras. Why? Because the more light you collect, the better your picture can be. And we pretty much reached the limit of what one camera can do a little while back. Two, three, even a dozen cameras can be put to work creating a single photo — the only limitation is the code that makes them work.
Apple Apple Hardware Event 2019 Gadgets Hardware iPhone iPhone 11 Pro Photography TC
Why does the new iPhone 11 Pro have 3 cameras?