A cylinder of length >1 ~m filled with water (μ=(4)/(3)) up to the...

A cylinder of length $\ell>1 \mathrm{~m}$ filled with water $\left(\mu=\frac{4}{3}\right)$ up to the brim, kept on a horizontal table is covered at its top by an equiconvex glass ( $\mu=1.5$ ) lens of focal length 25 cm when in air. At mid day, 12.00 noon, Sun is just overhead and light rays comes parallel to the principal axis of the lens. The sun rays will be focused