For a compound microscope, the focal lengths of object lens and eye lens are f_o and f_e respectively, then magnification will be done by microscope when 

• A

  ${\mathrm{f}}_0={\mathrm{f}}_{\mathrm{e}}$

• B

  ${\mathrm{f}}_0>{\mathrm{f}}_{\mathrm{e}}$

• C

  ${\mathrm{f}}_0<{\mathrm{f}}_{\mathrm{e}}$

• D

  None of these