What is X-Ray?
X-Rays are a form of electromagnetic radiation, as is visible light, but with some different characteristics.
The important characteristic of X-Rays is thatthese can penetrate or pass through the human body but cannot pass through bones, hard items like bullets etc. This effect produces shadow-like images of structures such as bones, bullets etc. on a photographic plate. This helps to understand the inner details of body such as presence of foreign hard materials (bullets etc.) or any fracture in the bones.
Refer to What is Light? under Physics section to understand the concept of Electromagnetic radiation.
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