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Not to scale) A large effective focal spot (left) can be made into a... | Download Scientific Diagram
![File:Diagram of line-focus tube depicting relation between actual focal spot and effective focal spot, extracted from Fundamentals of X-ray; physics and technique (1944).png - Wikimedia Commons File:Diagram of line-focus tube depicting relation between actual focal spot and effective focal spot, extracted from Fundamentals of X-ray; physics and technique (1944).png - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/d/d8/Diagram_of_line-focus_tube_depicting_relation_between_actual_focal_spot_and_effective_focal_spot%2C_extracted_from_Fundamentals_of_X-ray%3B_physics_and_technique_%281944%29.png)