<prompt> Wave length of UV A2 rays is200nm to 280nm280nm to 320nm320nm to 340nm340nm to 400nm  <response>: Ultraviolet light Ultraviolet light UV is made up of: Vacuum UVC 10-200 nm UVC 200-280 nm UVB 280-320 nm UVA 320-400 nm divided into UVAII 320-340 nm and UVAI 340-400 nm. Ref:- Review of Dermatology by Alikhan; pg num:-13 