Final answer:
When outside flat mirrors are properly adjusted, they should show the area beside and behind your vehicle, reducing blind spots, and the mirror should be half your height to see your entire body.
Step-by-step explanation:
Properly adjusted outside flat mirrors on a vehicle should allow you to see the area adjacent to the sides and rear of the vehicle, minimizing blind spots. According to the law of reflection, the angle of reflection equals the angle of incidence, meaning that the virtual image you see in the mirror is the same distance behind the mirror as the actual object is in front of it. To ensure full visibility, the top of the outside mirrors should align with your eye level and cover the areas that cannot be directly seen while seated in the driver's seat. Additionally, if you wish to see your entire body in a flat mirror, the mirror should be at least half your height, with its top edge at the level of your eyes, and this requirement does not change regardless of your distance from the mirror.