In today’s world, doctors can easily locate a fractured bone, a tumor, or a swallowed object, but this was not possible long before the discovery of X-Rays.
Actually, the X-rays were accidentally discovered in the process of performing different experiments. Wilhelm Roentgen, professor of physics was responsible for the discovery of X-Rays in 1895.
One day, he was testing whether cathode-ray could pass through glass or not. He has covered the glass with heavy black paper. He was surprised when he saw a green light passed through the glass and got projected on the fluorescent screen.
Then he performed experiments with different materials and the conclusion was the same every time that the ray would pass through the material and projects its image on the background screen. Since he did not know more about the rays, so he termed them as X rays, meaning Unknown. He later received the First Nobel prize in Physics for the discovery of these unknown rays.