Discussion
What is refractive index ?
Answer: C
Refractive index is the ratio of the speed of light in vacuum to its speed in the medium.
\[n = \frac{c}{v}\] It is always greater than one, since nothing travels faster than light in vacuum, and it measures how much the medium slows and hence bends the light. For water \(n = 1.33\) and for glass about 1.5.
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