Solve this multiple-choice question and choose the correct option.

Optics and media: In which medium does light travel at the maximum speed? Assume standard, non-dispersive comparison among common media. Choose the correct option.

Difficulty: Easy

Water
Glass
Air
Vacuum

Correct Answer: Vacuum

Explanation:

ConceptSpeed of light c is maximal in vacuum; in media v = c/n with refractive index n ≥ 1.

Final AnswerVacuum

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