The Millennium Development Goals (MDGs) aimed to reduce extreme poverty by which year?
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A.
2014
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B.
2015
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C.
2005
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D.
2008
Correct Answer:
B. 2015
Explanation:
The absolute refractive index (n) of a medium is defined by the ratio n = c/v, where c is the speed of light in a vacuum and v is its speed in the medium. Because the speed of light in a vacuum is the universal speed limit, v is typically smaller than c, resulting in a refractive index greater than 1. If the refractive index is less than 1, it indicates that the phase velocity of light within that specific medium is faster than its speed in a vacuum. This phenomenon often occurs in specialized environments like plasmas or with certain types of radiation like X-rays. In the context of the provided options, a refractive index below unity specifically signifies that light travels faster in that medium than in a vacuum.
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