a. Show that when the final image is not viewed at infinity, the angular magnification of...

a. Show that when the final image is not viewed at infinity, the angular magnification of an astronomical telescope may be expressed by

 

where moc is the linear magnification of the ocular and s” is the distance from the ocular to the final image,

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b. For such a telescope using two converging lenses with focal lengths of 30 cm and 4 cm, find the angular magnification when the image is viewed at infinity and when the image is viewed at a near point of 25 cm.