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If the critical angle for a glass–air boundary is 45º, what is the refractive index...

Physics
JAMB 2025

If the critical angle for a glass–air boundary is 45º, what is the refractive index of the glass?

  • A. \(\sqrt{2}\)
  • B. \(\sqrt{5}\)
  • C. \(\sqrt{3}\)
  • D. 2\(\sqrt{2}\)
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Correct Answer: Option A
Explanation

Answer: A

n = \(\frac{1}{\text{sinC}}\) = \(\frac{1}{sin45º}\)  = \(\sqrt{2}\).

There is an explanation video available below.

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Explanation Video

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