allerySnell's law introduces a constant known as the:
ARefractive index
BReflective index
CRepulsive index
DResistive index
Answer & Solution
Correct answer: A. Refractive index
1. The law relates the angles of incidence and refraction.
2. The constant is called the refractive index of the second medium with respect to the first.
3. So the correct answer is refractive index.
_Source: syllabus Physics Part II, Ch 9 'Ray Optics and Optical Instruments'_
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