(Take density of water $=1 \mathrm{~g} / \mathrm{cc}$ )
In water $\tan \frac{\theta}{2}=\frac{\mathrm{F}^{\prime}}{\mathrm{mg}^{\prime}}=\frac{\mathrm{q}^2}{4 \pi \varepsilon_0 \varepsilon_{\mathrm{r}} \mathrm{r}^2 \mathrm{mg}_{\text {eff }}}$
Equate both equations
$\varepsilon_0 g=\varepsilon_0 \varepsilon_{\mathrm{r}} \mathrm{g}\left[1-\frac{1}{1.5}\right]$
$\varepsilon_{\mathrm{T}}=3$
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$I$. Both the eye and the camera have convex lenses.
$II$. In order to focus, the eye lens expands or contracts while the camera lens moves forward or backward.
$III$. The camera lens produces upside down real images while the eye lens produces only upright real images.
$IV$. A screen in camera is equivalent to the retina in the eyes.
$V$. A camera adjusts the amount of light entering in it by adjusting the aperture of the lens. In the eye, the cornea controls the amount of light. Which of the above statements are correct?
