A point object O is placed at the origin of coordinate system. An equi-convex thin lens $\left({\mathrm{\mu }}_{\mathrm{g}}=1.5\right)$  focal length 20cm in air is placed so that its principal axis is along x-axis. Now the lens is cut at the middle (along the principal axis) and upper half is shifted along x-axis and y-axis by 20 cm and 2 mm respectively and right side of lower half is filed with water $\left({\mathrm{\mu }}_{\mathrm{w}}=4/3\right)$