The focal length of a converging lens is 10 cm. What is the angular magnification of this lens if the image is viewed by a relaxed eye with a near point of 25 cm?
A) 1.5
B) 3.5
C) 0.50
D) 4.5
E) 2.5

Question

Quizplus · Accepted Answer

The angular magnification (M) of a lens when the image is viewed by a relaxed eye is given by the formula M = D/f, where D is the near point of the eye (the closest distance at which the eye can see an object clearly, typically 25 cm for a normal eye) and f is the focal length of the lens. Here, D = 25 cm and f = 10 cm. Thus, M = 25 cm / 10 cm = 2.5.

The Focal Length of a Converging Lens Is 10 Cm