(Asked by Shobha)
Answer:
Formula used
\left [ \frac{1}{R_{1}}-\frac{1}{R_{2}} \right ] "\LARGE \frac{1}{f}=\left ( \mu _{2} -\mu _{1}\right )\left [ \frac{1}{R_{1}}-\frac{1}{R_{2}} \right ]")
For the lens to be converging, f must be positive and for it to be diverging, f must be negative
(a) In water the lens will be converging as the refractive index of glass is greater than that of water.
(b) In Carbon disulphide the lens is diverging as the refractive index of glass is less than that of CS2
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