Absolute refractive index of ruby is 1.71. What can you say about the speed of light in ruby?
a) It is slower by a factor of 1.71 relative to that in air.
b) It is higher by a factor of 1.71 relative to that in air
c) It is same as its speed in air
d) It is slower by a factor of 5.5 relative to that in air.
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Answer:
it is option A
Explanation:
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