The speed of light in vaccum is 3x10power8. it's speed in ruby of index of refraction 1.54 will be ?
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1.94 × 10^8 m/s
Refractive index of the given medium is defined in terms of velocity as
n=c/v
Where c=3×108m/s is the speed of light in vacuum.
n=1.54 refractive index of rubby
v is the speed of light in given medium
∴1.54=3×10^8/v
⇒v=3×10^8/1.54
⇒v= 1.94 ×10^8m/s
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