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Question

Among the following which one is used in detecting fake notes and documents?


  1. UV rays from fluorescent lamps

  2. Gamma rays from fluorescent lamps

  3. Infrared rays from fluorescent lamps

  4. Microwaves from fluorescent lamps


Solution

The correct option is A

UV rays from fluorescent lamps


In fake notes and documents, the ink which is used gives fluorescence effects after it is bombarded with UV rays. From this bank officers can find out which part of currency is glowing and which is not. This makes it easy to find out the fake currency as the fake currency does not show proper fluorescence where it is required. 
 

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