Q

A diamond has an absolute refractive index of 2.42. If the speed of light in vacuum is 3 x 10 m/s, which value best estimates the speed of light in diamond?

RRB Group D 09 Aug, 2026 (9:00 AM - 10:30 AM) 2026
✓ Answer: B 1.24 x 10 m/s
The correct choice is 1.24 x 10 m/s. It follows from the laws of reflection/refraction and the standard image-formation properties of lenses, mirrors or optical systems.
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