To increase the magnifying power of telescope  (f_o = focal length of the objective and f_e = focal length of the eye lens)

• A

  ${\mathrm{f}}_{\mathrm{o}}\text{ should be large and }{\mathrm{f}}_{\mathrm{e}}\text{ should be small }$

• B

  ${\mathrm{f}}_{\mathrm{o}}\text{ should be small and }{\mathrm{f}}_{\mathrm{e}}\text{ should be large }$

• C

  ${\mathrm{f}}_{\mathrm{o}}\text{ and }{\mathrm{f}}_{\mathrm{e}}\text{ both should be large }$

• D

  ${\mathrm{f}}_{\mathrm{o}}\text{ and }{\mathrm{f}}_{\mathrm{e}}\text{ both should be small }$