The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm. what is the angular magnification of the telescope?

The solution would be like this for this specific problem:

Given:

Focal length of the objective lens (fo) = 60 cm

Focal length of the eyepiece (fe) = 8.0 cm

Find:

angular magnification of the telescope = ?

So, the formula for angular magnification is:

a = f0 / fe

Where fo = objective lens, and fe = eye lens

So, we divide the total length of the objective lens by the total length of the eyepiece:

a = fo / fe

a = 60 cm / 8.0 cm

a = 7.5 cm

Therefore, the angular magnification of the telescope is 7.5 cm.