>>>Looking through binoculars into a mirror that is angled to view out a window, will I be able to focus on objects far away the same way I would without the mirror? Or does the surface of the mirror itself become a variable?
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>>The mirror is irrelvant. If it wasn't people could just put a mirror next to their eyes and wouldn't need glasses.
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>so they'd go around wearing mirrors?

Only if they wanted to reflect on things.