Physics
JAMB 1986
If the refractive index of glass is 1.5, what is the critical angle at the air-glass interface?
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A.
sin-1\(\frac{1}{2}\)
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B.
sin-1\(\frac{2}{3}\)
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C.
sin-1\(\frac{3}{4}\)
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D.
sin-1\(\frac{8}{9}\)
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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