In the rotating anode tube we have:
- a- Fine focus.
- b- broad focus.
- c- small focus.
- d- large focus.
- e- All of the above.
The correct answer for the focus in a rotating anode tube is: a. Fine focus
Here's why:
- Rotating anode tubes:
These tubes utilize a rapidly spinning anode to distribute the heat generated by the electron bombardment over a larger area. This prevents overheating and allows for higher power X-ray generation.
- Focus size:
The focal spot on the anode is where the electrons converge to produce X-rays. Due to the rotation, the focal spot on a rotating anode tube is inherently smaller compared to a stationary anode tube. This smaller size translates to finer detail in the resulting X-ray image.
Therefore, while other terms like "broad focus" or "large focus" might be used in different contexts, the primary characteristic of a rotating anode tube is its fine focus.
