Light is: an oscillating electric field alone. a fluctuating magnetic field alone. an oscillating electric field and a fluctuating magnetic field that are parallel to each other. an oscillating electric field and a fluctuating magnetic field that are perpendicular to each other. an oscillating electric field and a fluctuating magnetic field that are oriented randomly with respect to each other. Which of the following statements are true concerning light? The speed of light in matter is greater than the speed of light in a vacuum. The speed of light in matter is less than the speed of light in a vacuum. Its propagation direction is parallel to both the electric field and the magnetic field. Its propagation direction is perpendicular to both the electric field and the magnetic field. It moves at a constant speed through a vacuum. The speed of light is the same no matter what material it is traveling through.