PhysicsLight: refractionJAMB
The refractive index of glass is 1.5. The speed of light in the glass is: (c = 3 × 10⁸ m/s)
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Answer: D. 2 × 10⁸ m/s
v = c/n = 3 × 10⁸ / 1.5 = 2 × 10⁸ m/s.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.