A) (4/3) sin i
B) 1/sin i
C) 4/3
D) 1
Correct Answer: B
Solution :
For glass-water interface \[_{g}{{\mu }_{w}}=\frac{\sin i}{\sin r}\] ?(i) For water-air interface \[_{w}{{\mu }_{a}}=\frac{\sin r}{\sin {{90}^{o}}}\] ?(ii) \[\Rightarrow \] \[_{g}{{\mu }_{w}}\times {{\,}_{w}}{{\mu }_{a}}=\frac{\sin i}{\sin r}\times \frac{\sin r}{\sin {{90}^{o}}}=\sin i\] \[\Rightarrow \] \[\frac{{{\mu }_{w}}}{{{\mu }_{g}}}\times \frac{{{\mu }_{a}}}{{{\mu }_{w}}}=\sin i\Rightarrow {{\mu }_{g}}=\frac{1}{\sin i}\]
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