Dr Thokchom Nandakishore

Ultraviolet radiation is that portion of the electromagnetic spectrum with a narrow band of radiation from 200-400 nm. Spectrum – UVC (200-290 nm), UVB (290- 320 nm) and UV A (320-400nm –UV A 2 =320-340; UVA 1 = 340-400). UVA rays constitute 90-95% of the ultraviolet light reaching the earth and it is not absorbed […]