91. A thin lens is placed in the air, it has a refractive power D1 = 5 diopters, and a liquid D2 = 0,48 diopters. To determine the refractive index n2 of the liquid, if the refractive index n1 of glass from which the lens is made equal to 1.52.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)