Answer :
The focal spot refers to the region in the x-ray tube where x-rays are generated. here option a is correct.
The tungsten anode and an X-ray beam both produce X-rays. A positively charged anode and a negatively charged cathode make up the tube. The anode's edge is lined with tungsten targets. The anode's target region is where a stream of electrons collides so violently and forcefully that x-rays are generated. A common unintended side effect of many devices that operate with a high voltage and an electron source is the production of X-rays. We refer to these as incidental X-rays. The majority of X-ray devices start out by releasing electrons from a cathode, accelerating them with voltage, and allowing them to collide with an anode, which releases X-ray photons.
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