A double convex lens, made of a material of refractive index ${\mu }_1$ , is placed inside two liquids of refractive indices ${\mu }_2$  and ${\mu }_3$ , where ${\mu }_2>{\mu }_1>{\mu }_3$. A wide , parallel beam of light is incident on the lens from the left .The lens will give rise to

$\therefore$ analyzing the rays it gives a divergent ray above the axis and
convergent ray below ${\mu }_2>{\mu }_1>{\mu }_3$

from medium 2
$\Rightarrow$ when light ray enters into medium $1({\mu }_1)$ then moves away from normal

from medium 3

$\Rightarrow$ when light ray enters into medium $1({\mu }_1)$ the moves towards the normal.