science
Grade-7
Easy
Question
The absolute refractive index of a medium is the ratio of the speed of light in the ____ and ____.
- Glass and the medium
- Water and the medium
- Air and the medium
- None of the above
Hint:
Refractive index is calculated by the formula n=c/v.
The correct answer is: Air and the medium
The correct answer is d) none of the above.
The refractive index is the ratio between the speed of light in vacuum and the other given medium. It is unitless and non-dimensional range. The lowest or minimum refractive index is 1. It's value is always greater than 1 as speed of light is slower in all other mediums than in vacuum.
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