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## Homework Statement

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).

## Homework Equations

M=-(f_objective/f_ocular)

L=f_ocular+f_objective

## The Attempt at a Solution

f_objective=16-f_ocular

M=-(16-f_ocular)/f_ocular

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?