What is the angular magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye (image at the far point)having a near point of 25 cm and a far point at infinity?
A) 2.0 x
B) 3.0 x
C) 3.6 x
D) 4.0 x
E) 6.3 x

Question

Quizplus · Accepted Answer

Angular magnification is given by m = (D/f) (25/v)where D is the distance of distinct vision (25 cm), f is the focal length of the magnifying glass (4 cm), and v is the image distance (at infinity).Substituting these values, we get:m = (25/4) (25/∞) = 6.25xTherefore, the angular magnification of the magnifying glass is 6.3x.

What Is the Angular Magnification of a Magnifying Glass of Focal