$1($a$)$ Table Q$1$ below shows the $\%$ transmittance data for different concentrations of copper sulphate $(CuS{O}_4)$ solution measured using an incident wavelength of $650nm.$ The path length of the cuvette used is $0\mathrm{.}4cm.$

$($i$)$ Prove that the Beer$-$Lambert law is valid in the measured concentration range.

$[4$ marks$]$

$($ii$)$ Assuming the Beer$-$Lambert law is valid for all concentrations what will be the absorbance of a $0\mathrm{.}008MCuS{O}_4$ solution measured under the same experimental conditions as the other samples listed in Table Q$1$ below?

Table Q$1$

$[4$ marks$]$

$\backslash$table$[[\%T,80,40,20],[CuS{O}_4$ concentration $(M),0\mathrm{.}002,0\mathrm{.}004,0\mathrm{.}006]]$