A) Greater than the refractive index of glass
B) Smaller than the refractive index of glass
C) Equal to refractive index of glass
D) No case will be possible from above
Correct Answer: C
Solution :
\[\frac{{{f}_{l}}}{{{f}_{a}}}=\frac{{{(}_{a}}{{\mu }_{g}}-1)}{{{(}_{l}}{{\mu }_{g}}-1)}\] Þ \[{{f}_{l}}=\infty \] if \[_{l}{{\mu }_{g}}=1\] Þ \[_{a}{{\mu }_{l}}{{=}_{a}}{{\mu }_{g}}\].
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