The critical angle for light going from glass (\(\mu=1.5\)) to air is
A. \(\tan^{-1}\left(\frac23\right)\)
B. \(\sin^{-1}\left(\frac23\right)\)
C. \(\sin^{-1}\left(\frac12\right)\)
D. \(\sin^{-1}\left(\frac34\right)\)
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Answer: B. \(\sin^{-1}\left(\frac23\right)\)
\(\sin C=\frac1\mu=\frac23\).
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· 23 Oct 2026
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