A na-eji microscope fiber iji nyochaa ọnụnọ nke eriri.
Usoro a na-eji ọcha na-eji ọkụ ma na-enye echiche dị oke mkpa nke Ferrole na-akwụsị. Ọ nwere ezigbo ọrụ anya ọfụma ma na-emepụta nkọwa zuru oke nke nsị.