What is the unit of refractive index?
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A.
m /s
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B.
No unit
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C.
m⁻¹
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D.
Dioptre
Correct Answer:
B. No unit
Explanation:
The refractive index is a dimensionless quantity because it is defined as the ratio of the speed of light in a vacuum to the speed of light in a specific medium. Since it compares two identical physical quantities measured in the same units (meters per second), the units cancel each other out, leaving the refractive index with no unit. Therefore, it is a pure numerical value that indicates how much light slows down and bends when entering a material.
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