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Why do objects in your rear view mirrors only look larger than they really are on the passenger side of the car, not on the driver's side?

Answer:

The driver's side mirror is a normal mirror. It is close enough to let you see enough area to safely make land changes, etc. Because things look normal in it, you can judge distances when backing into parking spaces.

If the passenger side mirror was also a regular mirror, you would not see a large enough area. You can see what I mean by standing close to a mirror and noticing how much of the room you can see reflected. Then back away to the other side of the room and compare how much you can see.

To fix this, the passenger side mirror is slightly convex. This produces a "fish eye" effect, giving you a wider view. It also distorts sizes, so it makes it more difficult to judge distances, so don't rely on your passenger side mirror when backing up.

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