Inertia depends on which property of an object?
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A.
Acceleration
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B.
Velocity
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C.
Shape
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D.
Mass
Correct Answer:
D. Mass
Explanation:
The absolute refractive index of a medium is defined as the ratio of the speed of light in a vacuum to its speed within that specific medium. Mathematically, this is expressed as n = c/v, where c represents the speed of light in a vacuum and v represents its speed in the medium. If the refractive index is less than 1, it indicates that the value of v is greater than c, meaning light travels faster in that medium than it does in a vacuum. While the speed of information or energy cannot exceed the speed of light in a vacuum, certain conditions—such as X-rays passing through materials or light moving through plasma—can result in a phase velocity that exceeds c, leading to a refractive index below unity.
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