Official Answer
Answer
Fadada wuce gona da iri yana faruwa lokacin da aka miƙe zoben sama da iyakar sa na roba yayin shigarwa akan sandar. Wannan yana haifar da nakasar filastik ta dindindin, ma'ana zoben ba zai ƙara 'tsaye' zuwa ainihin $D_{id}$ ba. Ringan da aka faɗaɗa sama da ƙasa zai sami sassauci a cikin tsagi, wanda ke rage girman ƙarfin ƙarfinsa kuma yana ƙara haɗarin rushewa a ƙarƙashin girgiza. Ana iya gano shi ta hanyar auna 'manne' na zobe; idan ana iya jujjuya zoben cikin sauƙi da hannu ko kuma idan akwai hasken da ake iya gani tsakanin zoben da kasan tsagi, an faɗaɗa shi fiye da kima. A cikin layi na atomatik, ana amfani da micrometers na laser don duba diamita da aka shigar don tabbatar da ya dace da ƙayyadaddun ƙira.
