Solution:
Solution:
Here, $$R_1 = 20 \,cm, R_2 = - 20 \,cm, u = -10\, cm$$
and $$\mu = 1.56$$
Using lens make'rs formula,
$$\frac{1}{f} = \left(1.56 -1\right)\left(\frac{1}{20}+\frac{1}{20}\right)$$
$$ \Rightarrow f = \frac{20}{0.56\times2} = 17.86 \,cm $$
Now, from lens equation,
$$v = \frac{uf}{u+f} = \frac{-10\times 17.86}{-10+17.86} = -22.86 \,cm$$
Since $$v$$ is negative, the image will be formed on the same side as that of object.