Final answer:
Varying the exposure time can alter the radiographic image in terms of its intensity or darkness. Increasing the exposure time can result in a darker image, while decreasing it can lead to a lighter image. The choice of exposure time depends on the desired outcome or purpose of the radiographic image.
Step-by-step explanation:
Exposure time refers to the duration that the radiographic film is exposed to radiation. Varying the exposure time can alter the radiographic image in several ways.
When the exposure time is increased, there is more time for the film to be exposed to radiation. This can result in a darker or more intense image. Conversely, decreasing the exposure time can lead to a lighter or less intense image.
For example, in medical imaging, a longer exposure time may be needed to capture detailed structures, while a shorter exposure time may be used for faster imaging techniques or to reduce motion blur.