<prompt> A 40 year old male patient came for routine dental checkup. Patient gives history of root canal treatment with 17 and 27 done using excimer. This type of lasers are:Special infrared lasersSpecial ultraviolet lasersSpecial visible light lasersSpecial blue light lasers  <response>: The lasers range from long wavelengths infrared, through visible wavelengths, to short wavelengths ultraviolet. Excimers are special ultraviolet lasers. 