\(e{V_S} = \frac{{hc}}{\lambda } - h{v_0}\,\)

\( \Rightarrow \,\,\,6{V_0}e = \frac{{hc}}{\lambda } - h{v_0}\,\,\,......(1)\)

\(\,2{V_0}e = \frac{{hc}}{{2\lambda }} - h{v_0}\,\,\,\,\,\,....(2)\)

સમીકરણ \((2)\) ને \('3'\) વડે ગણીને સમીકરણ \((1)\) માંથી બાદ કરો

\( \Rightarrow \,\frac{{2hc}}{{2\lambda }} - 3h2v - \frac{{2hc}}{{2\lambda }} + h{v_0} = 0\)

\(\frac{{hc}}{{2\lambda }} - 2h{v_0}\)

\( \Rightarrow \,\,\,\,\,\frac{c}{{4\lambda }} = {v_0} = \frac{c}{{\lambda '}}\)

\( \Rightarrow \lambda ' = 4\lambda \)