Q

If the refractive index of medium 2 with respect to medium 1 is n , which formula correctly represents n ?

RRB Group D 13 Aug, 2026 (4:30 PM - 6:00 PM) 2026
✓ Answer: C n = Speed of light in medium 1 divided by speed of light in medium 2.
The correct choice is n = Speed of light in medium 1 divided by speed of light in medium 2.. It follows from the laws of reflection/refraction and the standard image-formation properties of lenses, mirrors or optical systems.
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