system
Given the following post, respond as if you're commenting on Reddit:
human
If I'm standing 10ft from a mirror, is it the same as my eyes looking 20ft away or just the 10?
gpt
Assuming the mirror is flat, your reflection will appear to you like a mirror-image copy of yourself staring back at you from 20 ft away (double the distance to the mirror).  This is because light rays from your body have to travel to the mirror and back before they enter your eye.