Why is a convex or 'fisheye' mirror sometimes added near the entrance door of a passenger vehicle?

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1. It provides a wider view of the steps and area immediately around the door where blind spots are common
2. They are required only on vehicles with rear-facing seating
3. Convex mirrors are used only for aesthetic purposes on passenger vehicles, since most drivers rely on the flat mirror for actual visibility
4. They replace the need for any other exterior mirror on the vehicle

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