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

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

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

(OP)
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?

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

(OP)
Thank you!

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