Each of the following statements regarding vertical angulation is correct EXCEPT one. Which one is the EXCEPTION?
a. The correct vertical angulation for bitewing radiographs is +10 degrees.
b. Vertical angulation is indicated on a dial on the side of the tube head.
c. Negative angulation directs the central ray downward toward the floor.
d. Vertical angulation is measured in degrees.
c. Negative angulation is the positioning of the central ray upward toward the ceiling.
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