\(\because \,\,\,{v_e}\, = \,\,\infty ,\,\,{u_e} = \,\,{{f}_e} = \,\,6.25\,\,\,cm\)

\(\therefore \,\,\,{v_0} = \,\,15 - 6.25\,\,\, = \,\,\,8.75\,\,\,cm\)

\(\because \,\,\,\frac{1}{{{v_0}}}\,\, - \,\frac{1}{{{u_0}}}\,\,\, = \,\,\,\frac{1}{{{{f}_0}}}\)

\(\therefore \,\,\,\frac{1}{{{u_0}}}\,\, = \,\,\frac{1}{{{v_0}}} - \frac{1}{{{{f}_0}}}\,\, = \,\,\frac{1}{{8.75}} - \frac{1}{{20}}\,\, = \,\,\,\frac{{2 - 8.75}}{{17.5}}\,\,\, \Rightarrow \,\,\,{u_0} = \frac{{ - 17.5}}{{6.75}}\,\, = \,\, - 2.59\,\,cm\)

મેગ્નિફાઇંગ પાવર \( = \,\,\,\frac{{{v_0}}}{{|{u_0}|}}\,\,\, \times \,\,\,\left[ {1 + \frac{D}{{{{f}_e}}}} \right]\,\, = \,\,\,\frac{{{v_0}}}{{|{u_0}|}}\,\, \times \,\,\,\frac{D}{{|{u_e}|}}\,\,\, = \,\,\,\frac{{8.75}}{{2.59}}\,\, \times \,\,\frac{{25}}{{6.25}}\,\, = \,\,13.51\,\)