A Lens of Focal Length 90 Mm Is Used as a Magnifier

Multiple Choice

A lens of focal length 90 mm is used as a magnifier by a person with a near point of 25 cm.The object being viewed is 9.9 mm long,and is positioned at the focal point of the lens.What is the angle subtended by the image at infinity,in milliradians?

A) 110 mrad
B) 73 mrad
C) 37 mrad
D) 147 mrad
E) 183 mrad