In a compound microscope the objective of f_o and eyepiece of f_e are placed at distance L such that L equals 

• A

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

• B

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

• C

  $\text{ Much greater than }{\mathrm{f}}_{\mathrm{o}}\text{ or }{\mathrm{f}}_{\mathrm{e}}$

• D

  $\text{ Much less than }{\mathrm{f}}_0\text{ or }{\mathrm{f}}_{\mathrm{e}}$