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: B
Solution :
If a lens (made of glass) of refractive index\[{{\mu }_{g}}\]is immersed in a liquid of refractive index\[{{\mu }_{l}},\]then its focal length in liquid\[{{f}_{l}}\]is given by \[\frac{1}{{{f}_{l}}}={{(}_{l}}{{\mu }_{g}}-1)\left[ \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right]\] ?(i) If\[{{\mu }_{g}}<{{\mu }_{l}},\]then\[{{f}_{l}}\]and\[{{f}_{a}}\]have opposite signs and the nature of lens changes ie, convex lens diverges the light rays and concave lens converges the light rays.
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