Final answer:
Stereoscopic radiography is the technique for depth determination that uses two radiographs and a stereoscope based on the separation of an average adult human's eye.
Step-by-step explanation:
The technique for depth determination that uses two radiographs and a stereoscope based on the separation of an average adult human's eye is Stereoscopic radiography. Stereoscopic radiography involves taking two X-ray images from slightly different angles and viewing them together through a stereoscope, which creates a three-dimensional perception of the object being imaged. By comparing the images, depth information can be determined.