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.You need to login to perform this action.
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