A surveyor uses a convex lens as a magnifying glass to examine a crack in a concrete wall.
The crack has an actual width of 1.5 mm1.5\text{ mm}1.5 mm.
The magnifying glass produces a magnification of 4.24.24.2.
Calculate the width of the image of the crack when viewed through the magnifying glass.
State two characteristics of the image formed by this magnifying glass.