The graph between 1/λ and stopping potential (𝒱) of three metals having work functions   ${\varphi }_1, {\varphi }_2$ and  ${\varphi }_3$  in an experiment of photoelectric effect is plotted as shown in the figure.

 
Which of  the following statement(s)is / are correct? (Here, λ is the wavelength of the incident ray).
 

From the equation of photoelectric effect.
 $eV=\frac{hc}{\lambda }-\varphi orV=\left(\frac{hc}{e}\right)\left(\frac{1}{\lambda }\right)-\frac{\varphi }{e}$
This is equation of straight line.
 $Y=mx+c$
Slope is  $\tan \theta =\frac{hc}{e}$
 $$\begin{gathered} {\varphi }_1:{\varphi }_2:{\varphi }_3=\frac{hc}{{\lambda }_{01}}:\frac{\lambda c}{{\lambda }_{02}}:\frac{hc}{{\lambda }_{03}} \\ =\frac{hc}{{\lambda }_{01}}:\frac{\lambda c}{{\lambda }_{02}}:\frac{hc}{{\lambda }_{03}}=1:2:4 \\ \frac{hc}{{\lambda }_{01}}=0.001n{m}^{-1}or{\lambda }_{01}=10000A^0 \\ \frac{hc}{{\lambda }_{02}}=0.002n{m}^{-1}or{\lambda }_{02}=5000A^0 \\ \frac{hc}{{\lambda }_{03}}=0.004n{m}^{-1}or{\lambda }_{03}=2500A^0 \end{gathered}$$
 
 
 
 
Violet colour has wavelength $4000A^0$  . So, violet colour can eject photoelectrons from metal-1 and metal-2