A) equal to that of water
B) less than that of water
C) greater than that of water
D) Nothing can be predicted
Correct Answer: C
Solution :
\[\frac{1}{f}=({{\,}_{I}}{{\mu }_{g}}-1)\left( \frac{I}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] If \[{{\mu }_{g}}\,c\mu \,\,l,\] then\[{{f}_{e}}\]and\[{{f}_{a}}\]have opposite signs and the nature of lens changes i.e., convex lens diverges the light rays and concave lens converges the light rays.
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