[填空题]
When a Newton’s ring apparatus (Fig. 24–31) is immersed in a liquid*ghg3qauhi 75x8 c,eo, the dia *n18izefynd z95vd1:dq i h.q)ikcl*meter of the eighth dark ring decreases from 2.92 cm to 2.48 cm. What is the refractive indef9dd1hl: 8edn*q i qk1) yi5z*zinvc.x of the liquid?
