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CBSE Class 10 Answered

Exam is 1 day away! Please rply fast.
1. What is the difference between refractive index and refractive indices?
2. What is the difference between refractive index and absolute refractive index?
3. (Please answer this question is steps and methods or reasons to do this step, for eg: First take the refractive index and now do this etc etc..... Please provide reasons why you did that step and whi it is necessary to obtain the results)
  The refractive indices of water and glass with respect o air are 4/3 and 3/2 respectively. If the speed of light in glass is 2x10 raised to 8 m/s, find the speed of light in 1. air, 2. water.
Please be very specific and not to much complicated. 
Thank you!
Asked by Gourav Barik | 01 Mar, 2015, 03:04: PM
answered-by-expert Expert Answer
1. Refractive indices is the plural of refractive index.
2. Refractive index of a medium is the ratio of speed of light in vacuum ( or air, as speed of light in air is almost equal to the speed of light in vacuum) to the               speed of light in a medium.
    When light is going from vacuum to another medium, then the value of refractive index is called the absolute refractive index.
    The absolute refractive index of a medium is just called its refractive index.
 
Please ask the other query as a seperate question.
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