Light travels at the fastest speed in A. Glass B. Water C. Hydrogen D. Vacuum Share with your friends Share 0 Satyendra Singh answered this D) VACUUM, because its refractive index is least. 1 View Full Answer Nishtha Verma answered this I THINK THE ANSWER IS GLASS 0 Sanya Jain answered this LIGHTS TRAVELS IN A FASTEST SPEED - GLASS, WATER, HYDROGEN AND VACUUM etc. 3 Ishat Pandit answered this Light travels fastest in D. vacuum - 2,99,792 km/second. 0
