Why are objects in the side-view mirror closer than they appear

quot;Objects in mirror are closer than they appear." That little line appears so often and in so many contexts, it's almost lost all meaning -- but why is it there, and what does physics have to do with it?

Side view mirror Decal – JP Gear

Objects in mirror are closer than they appear - Wikipedia

Objects in the mirror are closer than they appear. : r/JDMGame

Closer Than They Appear

Objects in the mirror are closer than they appear hi-res stock

The NAPA Network - If you thought your sideview mirrors said

Why are objects in the side-view mirror closer than they appear

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Objects in Mirror are Closer than they Appear - Rosie Jensing