Question

In which medium slowest speed of light is recorded?

Answer 1

Light travels slowest in diamond which is a solid.

During a refractive index experiment, it was concluded that light travels slowest in diamond which is a solid and fastest in vacuum or air.

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Answer 2

Explanation:

In 1998, Danish physicist Lene Vestergaard Hau led a combined team from Harvard University and the Rowland Institute of Science, which succeeded in slowing a beam of light to about 17 meters per second,and researchers at UC Berkeley slowed the speed of light traveling through a semiconductor to 9.7 kilometers per hour