If a material has an absolute refractive index of 1.7, what does this imply about the speed of light in that material compared to vacuum?

Question

If a material has an absolute refractive index of 1.7, what does this imply about the speed of light in that material compared to vacuum? — Exam MCQ

rrbjepyq.in · Accepted Answer

D. Light travels 1.7 times slower in the material than in vacuum. — The refractive index n = c/v, where c is the speed of light in vacuum and v is its speed in the material. For n = 1.7, the speed of light in the material is c/1.7, so it is lower than in vacuum.

rrbjepyq.in · Answer

A. Light travels 1.7 times faster in the material than in vacuum.

rrbjepyq.in · Answer

B. Light travels at the same speed in both.

rrbjepyq.in · Answer

C. The speed difference cannot be determined from this value.

If a material has an absolute refractive index of 1.7, what does this imply about the speed of light in that material compared to vacuum?

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