1.a) Design an astronomical telescope with an angular magnification of +5 (pay attention to + sign !) and
length of 16 cm, i.e. compute fobjective and focular).
The Attempt at a Solution
f_ocular = -4 cm
f_objective= 20 cm
I have found like that, but it says that it is an astronomical telescope in the question, where am I doing wrong. Astronomical telescope must consist of 2 convergent lenses, isn't it?