Light travels fastest through which of the following?
A B C D
air glass water a vacuum
Question: Light travels fastest through which of the following?
(A) air
(B) glass
(C) water
(D) a vacuum

Answer: (D) a vacuum
Answer: (B) glass
Question: Light travels fastest through which of the following?
(A) air
(B) glass
(C) water
(D) a vacuum
Answer: (D) a vacuum