I'm trying to make a handmade telescope, but I'm stuck with the lenses I bought 2 lenses. they are the same "convex from one side and concave from the other side" like glasses lenses. then I knew that I need a double convex for both the object lens and the eyepiece lens. so I decided to put the 2 lenses that I bought together to make a double convex lens so now air is in between the two lenses. Is what I did going to give me a double convex lens?!