optics,how many images will the object form??? 1. The problem statement, all variables and given/known data the lens shown in figure 19.16(http://img705.imageshack.us/img705/5066/figure1916.png [Broken] made of two different materials . a point object is placed on the axis....how many images will the object form??? 2. Relevant equations 1/f = (n-1) [1/R1 - 1/R2], where f is the focal length, n is the refractive index, R1,R2 - radii of the curvature of refracting surfaces. 3. The attempt at a solution i didnt reach the answer but i think it has something with refractive index , and focal lenth.....plz help..