Question
State the approximate value of the critical angle for glass-air surface
✓
Answer
The critical angle for glass-air surface is
For glass, refractive index $a \mu g=\frac{3}{2}$
$\sin i_c=\frac{1}{a \mu g}=\frac{2}{3}$ or $i_c=42^{\circ} z$
For glass, refractive index $a \mu g=\frac{3}{2}$
$\sin i_c=\frac{1}{a \mu g}=\frac{2}{3}$ or $i_c=42^{\circ} z$
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