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If the refractive index of glass is 1.5, what is the critical angle at the...

Physics
JAMB 1986

If the refractive index of glass is 1.5, what is the critical angle at the air-glass interface?
  • A. sin-1\(\frac{1}{2}\)
  • B. sin-1\(\frac{2}{3}\)
  • C. sin-1\(\frac{3}{4}\)
  • D. sin-1\(\frac{8}{9}\)
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Correct Answer: Option B
Explanation
sin ic \(\frac{1}{n}\) = \(\frac{1}{1 - 5}\)

i = sin-1\(\frac{1}{1 - 5}\)

= sin-1\(\frac{10}{15}\)

= sin-1\(\frac{2}{3}\)

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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