Which of the following states is NOT covered under the Atal Bhujal Yojana?
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A.
Maharashtra
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B.
Jharkhand
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C.
Uttar Pradesh
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D.
Rajasthan
Correct Answer:
B. Jharkhand
Explanation:
The refractive index ($n$) of a medium is defined by the ratio of the speed of light in a vacuum ($c$) to its speed within that medium ($v$), expressed as $n = c/v$. Under standard physical conditions, light slows down when entering a material, resulting in a refractive index greater than 1. If the absolute refractive index is less than 1, it mathematically indicates that the phase velocity of light in that specific medium is greater than its speed in a vacuum. While the theory of relativity dictates that information cannot travel faster than $c$ (the group velocity), certain exotic conditions or materials—such as plasmas, X-rays in specific media, or metamaterials—can exhibit a phase velocity exceeding $c$, leading to a refractive index below unity.
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