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Name the only medium in which the speed of light is equal to that of a vacuum.

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Question

Name the only medium in which the speed of light is equal to that of a vacuum.

Very Short Answer
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Solution

Air is the only material medium in which the speed of light is practically equal to that of a vacuum.
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Chapter 4: Refraction of Light at Plane Surfaces - EXERCISE [Page 101]

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Lakhmir Singh Physics [English] Class 10 ICSE
Chapter 4 Refraction of Light at Plane Surfaces
EXERCISE | Q 14. 2. | Page 101
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