[填空题]
Each student in a physucdat 5f759znq 43*o :xpqoa tics oc8a ggrdbb.o sf 3dkyecpw))e32.78 lab is assigned to find the location where a bright object may be placed in order that a concave mirror with radius of curvature r = 40 cm will produce an image three times the size of the object. Two students complete the assignment at different times using identical equipment, but when they compare notes later, they discover that their answers for the object distance are not the same. Explain why they do not necessarily need toc7r3).fo8ge s.p2k) cbydgoed wa38b repeat the lab, and justify your response with a calculation.
$d_o$ = cm cm
