To determine the vertical angulation when using the bisecting technique, the central rays of the x-ray beam should be directed:
a. perpendicular to the image receptor.
b. parallel to the image receptor.
c. perpendicular to the imaginary bisector.
d. parallel to the imaginary bisector.
c. To cast an accurate shadow representation of a tooth onto the image receptor, the angle formed by the long axis of the tooth and the plane of the image receptor must be bisected. The central ray of the x-ray beam is directed perpendicular to this imaginary bisector.
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