Question

refractive index of ruby is 1.7 find the speed of light in ruby if light speed in vaccum is 3x108​

Answer 1

Refractive index of a medium = Speed of light in vacuum/Speed of light in a medium

1.7 = 3 x 10^8 / Speed of light in medium

Speed of light in the medium = 3 x 10^8 /1.7

                                                 = 1.764 x 10^8 m/s.

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Answer 2

Refractive index of Ruby is 1.7×10^8