Physics - Geometrical Optics Question with Solution | TestHub

Given,${ }_a{\mathrm{\mu }}_{\mathrm{g}}={ }_a{\mathrm{\mu }}_l$

The focal length of convex lens in liquid$f$is given by

$\frac{1}{f}=\left(\frac{{ }_a{\mathrm{\mu }}_{\mathrm{g}}}{{ }_a{\mathrm{\mu }}_l}-1\right)\left(\frac{1}{R_1}-\frac{1}{R_2}\right)$

$\frac{1}{f}=\left(1-1\right)\left(\frac{1}{R_1}-\frac{1}{R_2}\right)$

$\frac{1}{f}=0$

$\mathrm{O}\mathrm{r} f= \infty$

Its focal length will become infinite.