This is correct. Another good example is trying to read text across the room through a planar mirror if you’re nearsighted. Let’s say you can read text clearly without glasses if it’s a foot away but not if it’s 20 feet away. If you’re standing 1 foot from a mirror looking at text 20 feet behind you, light from the text will have to travel about 22 feet before it reaches your eyes, and you won’t be able to read it without glasses because you’re effectively trying to look at text that is 22 feet away, not 1 foot away.