A Lens of Focal Length 40 Mm Is Used as a Magnifier.The

Multiple Choice

A lens of focal length 40 mm is used as a magnifier.The object being viewed is 5.3 mm long,and is positioned at the focal point of the lens.The user of the magnifier has a near point at 25 cm.What is the angular magnification of the magnifier?

A) 6.3
B) 5.6
C) 6.9
D) 7.5
E) 8.1