17. 18. Use the following information to answer the next question. The relative sensitivity of a normal human eye to radiant energy of fixed intensity is illustrated in the graph below. 100 80 E E." '5 :43 E 3 .3 i": 52 400 500 600 700 800 Wavelength of radiant energy (nm) The normal human eye shows the greatest sensitivity to A. ultraviolet light B. green light C . violet light D. red light There is a relationship between the direction of propagation of an electromagnetic wave and the directions of its electric and magnetic fields. In this relationship, the electric and magnetic fields are A. parallel to each other and parallel to the direction of propagation parallel to each other and perpendicular to the direction of propagation perpendicular to each other and parallel to the direction of propagation POP perpendicular to each other and perpendicular to the direction of propagation