Refractive index of material is approximately equal to square root of: A. Electrical permittivity B. Magnetic permittivity C. Electrical permittivity x magnetic permittivity D. None of these 0 0 votes Article Rating Subscribe Login Notify of new follow-up comments new replies to my comments Label {} [+] Name* Email* Label {} [+] Name* Email* 0 Comments Oldest Newest Most Voted Inline Feedbacks View all comments