^{26}The field of view (a circle where the viewing “cone” intercepts the flat surface of the object) increases linearly in
diameter with increases in distance between the sensor and the object. However, since the area of a circle is proportional to
the square of its diameter (A = πD^{2}
4 or A = πr^{2}), we may say that the viewing area increases with the square of the distance
between the sensor and object.