Which of the following statement(s) is are correct regarding scattering of light?
$\left(\mathrm{i}\right)$ Scattering is responsible for the bluish appearance of the sky.
$\left(\mathrm{ii}\right)$ Clouds having droplets of water scatter all wavelengths almost equal and so are generally white.
$\left(\mathrm{iii}\right)$ Advanced sunrise and delayed sunset.

Consider the given statements and select the correct option which correctly identifies true (T) and false (F).
$\left(\mathrm{i}\right)$ The focal length of the eye lens increases when eye muscles are relaxed and lens becomes thinner.
$\left(\mathrm{ii}\right)$ Stars appear to twinkle because of movement of air only.
$\left(\mathrm{iii}\right)$ In the dim light, the size of pupil increases.
$\left(\mathrm{iv}\right)$ The blind spot on retina has high concentration of nerve ending.