Line Perpendicular to a Plane

I found this image online here

This is a Doppler radar, and it helps us to predict the weather. This represents a line perpendicular to a plane because the Doppler radar rises at a 90°  from the ground, which makes this scenario perpendicular. The plane is represented by the ground the radar stands on, and the line is represented by the Doppler. Doppler radars use the Doppler effect to determine the distance of objects. These can be found in most first world countries in various areas, as it is used for weather prediction