Question

A giant refracting telescope has an objective lens of focal length 15 m. If an eye piece of focal length 1.0 cm is used, what is the angular magnification of the telescope ?

Answer 1

Let:

f₀ = Focal length of the objective lens = 15 m = 1500 cm

f_e = Focal length of the eye lens = 1.0 cm

Angular magnification of the giant refracting telescope is given by

`m_0=|f_0/(f_e)|`

`:.m_0=|1500/1|=1500`