Why a Cars WINDSHIELD is so large & the Rear view Mirror is so small?
It’s normal, just don’t expect the same size of rear view mirror like the windshield. The windshield is designed to have better view and to minimize blind spot by following the car design. While the rear view mirror has been design to look back in full of the rear window, the glass isn’t flat to have a wide sight and closer. Just like the side mirror.