Final answer:
Convex mirrors are installed on all new school buses. They provide a wider field of view, reducing blind spots, although the image produced is smaller and distorted.
Step-by-step explanation:
The type of mirror that must be installed on all new school buses, in addition to the regular outside rear view mirrors, is a convex mirror.
A convex mirror is a mirror that curves outwards, causing light rays to diverge. This allows the driver to have a wider field of view, as the mirror reflects a larger area. Convex mirrors are commonly used for rear-view mirrors in vehicles because they provide a wider view of the surroundings and reduce blind spots.
The main disadvantage of using a convex mirror compared to a flat one is that the image produced by a convex mirror is smaller and distorted. However, the benefit of having a wider field of view and reducing blind spots outweighs the disadvantage of the smaller and distorted image.