Mirrors. What focal length do your eyes require up close?

[racookpe1978]

Not a significant question in the realm of things, but ...

If your eyes are 3 inches apart, and you are looking at something on the table, clearly, your eyes focus on the actual surface. 3 inches away, 6 or 8 inches away, they look at the surface. If I am wearing trifocals, then the lens that is at the right focus distance brings that surface into clear view.

But, what happens in a mirror?

The image is reversed right-to-left, but where is the focal length of the surface? At the eye-to-mirror distance? Or at the eye-to-image distance?

 

[IRstuff]

At the eye-to-image distance; mirrors produce virtual images, i.e., what you see appears to come from behind the mirror at the same distance the real image is at in front of the mirror.

TTFN
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[racookpe1978]

Thank you!