Rogenton while making some experiments with a discharge tube in 1895, found that when cathode rays are allowed to fall on a metal target called anti-cathode or target material placed in their path, new type of radiation s are produced. These radiations are called X-rays. These rays are also electromagnetic in character and are comparable to light waves. The stream of cathode rays (i.e. electrons) produced from the cathode converges to a point through a concave surface on the anti-cathode and give rise to X-rays.
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