A 5.0 cm focal length lens is used as a magnifier. Assuming a near point of 25 cm, about what magnification is attained?
A) 25
B) 10
C) 60
D) 1.2
E) 5

Question

Quizplus · Accepted Answer

The magnification (M) of a magnifying lens is given by the formula M = 1 + (D/f), where D is the near point distance (25 cm) and f is the focal length (5 cm). Substituting the values, M = 1 + (25/5) = 1 + 5 = 6. However, the closest option to this calculation is 5.

A 50 Cm Focal Length Lens Is Used as a Magnifier