Two lenses of power -1. 75d and 2. 75d are placed in contact. What is the focal length of the combination?.

Iread this book last year so take this with a grain of salt.gene jumps from the tree to compete with finny due to the fact that gene is always trying to do better than finny. he is put under the grasp of peer pressure due to finny almost forcing him to do this. ever since he first jumped finny kept pressuring him to jump since he thought gene enjoyed jumping.rather than uses this answer you should probably just reread chapters 3-4

It is d, all the other ones say incorrect answer .

Ireally don’t know

Answer is trees if this doesnt try using google