Which of these is not a shadow-casting principle?
A) A large focal spot
B) Long target—image receptor distance
C) Short object—image receptor distance
D) Parallel object—image receptor relationship
A
Explanation: A) A small focal spot reduces the size of the penumbra (partial shadow around the objects of interest), resulting in a sharper image and slightly less magnification.
B) A small focal spot reduces the size of the penumbra (partial shadow around the objects of interest), resulting in a sharper image and slightly less magnification.
C) A small focal spot reduces the size of the penumbra (partial shadow around the objects of interest), resulting in a sharper image and slightly less magnification.
D) A small focal spot reduces the size of the penumbra (partial shadow around the objects of interest), resulting in a sharper image and slightly less magnification.
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