Marooned on a desert island and with a lot of time on your hands, you decide to disassemble your glasses to form a crude telescope with which you can scan the horizon for rescuers. Fortunately, you are farsighted, and as for most people your two eyes encompass somewhat different lens prescriptions. Your left eye employs a lens of power +4.5 D and your right eye's lens is +3.0 D
i) Which lens must you use for the objective and which for the eyepiece? Describe why.
ii) Determine the magnification of your telescope?
iii) Around how far apart must the two lenses be when you focus on the distant objects?