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.
IIT JEE
Physics
Difficulty: Easy
Choose an option
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AWater
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BGlass
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CAir
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DVacuum
Answer
Correct Answer: Vacuum
Explanation
ConceptSpeed of light c is maximal in vacuum; in media v = c/n with refractive index n ≥ 1.
Final AnswerVacuum