View Single Post
 Sci Advisor HW Helper P: 1,772 The refractive index of air is 1.0003 . Unless you have very good measuring devices, I don't immediately see how you are to measure that. Usually, it is assumed to be 1.000 unless you need extreme precision. Are you sure you have conveyed the requirements correctly? ARe you perhaps supposed to measure the focal length of the lens in air?