Your telescope has an objective lens with a focal length of 0.90 m . You point t

Question

Your telescope has an objective lens with a focal length of 0.90 m . You point the telescope at the moon, only to realize that the eyepiece is missing. Even so, you can still see the real image of the moon formed by the objective lens if you place your eye a little past the image so as to view the rays diverging from the image plane, just as rays would diverge from an object at that location.

What is the angular magnification of the moon if you view its real image from 25 cm away, your near-point distance?

Explanation / Answer

angular magnification for a telescope is m = - f_objective lens/f_eyepiece

here eye piece is missing and directly forming image on eye at near point distance of 25 cm.

m = -f_objective lens/25 cm

m = -120/25 = - 4.8.

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