7. The speed of light -
on entering a medium from vacuum.
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4
Answer:
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Explanation:
The metre is the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second. This defines the speed of light in vacuum to be exactly 299,792,458 m/s.
Answered by
3
Answer:
decreases when light enters medium from vacuum
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