A) Convergent lens
B) Divergent lens
C) Plane glass plate
D) Like a prism
Correct Answer: B
Solution :
[b] The focal length of lens in water is given by \[{{f}_{\ell }}=\frac{_{a}{{\mu }_{g}}-1}{\frac{_{a}{{\mu }_{g}}}{_{a}{{\mu }_{\ell }}}-1}{{f}_{a}}=\frac{1.2-1}{\frac{1.2}{1.33}-1}{{f}_{a}}=-\frac{0.2\times 1.33}{0.13}{{f}_{a}}\] Hence f is negative and as such it behave as a divergent lens.
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