Rhodopsin has a peak sensitivity to light of wavelength:: (A) 100 nm, (B) 355 nm, (C) 505 nm, (D) None of the above
Answer is C. The photosensitive pigment in the rods is called rhodopsin (visual purple). Its opsin is called scotopsin. Rhodopsin has a peak sensitivity to light at a wavelength of 505 nm. Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 12.