Visible spectrum of light: (A) 370 - 740 nm, (B) 740-1140 nm, (C) 200 - 370 nm, (D) 200 - 370 nm
Answer is A. Ans. is 'a' i.e., 370-740 nm o As perceived by the human eye; light consists of those wavelengths of electromagenatic radiation (approximately 400-700 mm) which are capable of eliciting retinal response.