A magnifying glass has a focal length of $7.0 \mathrm {~cm}$. What is the angular magnification if the image is viewed by a person having a relaxed eye with the near point of $25 \mathrm {~cm}$ ?
A) $2.6$
B) $1.6$
C) $3.6$
D) $4.6$

Question

Quizplus · Accepted Answer

The angular magnification $ M $ for a magnifying glass when the image is viewed with a relaxed eye is given by $ M = \frac{25}{f} $, where $ f $ is the focal length. Substituting $ f = 7.0 \, \text{cm} $, we get $ M = \frac{25}{7} \approx 3.6 $.

A Magnifying Glass Has a Focal Length Of 7.0 cm7.0 \mathrm {~cm}7.0 cm

A Magnifying Glass Has a Focal Length Of $7.0 \mathrm {~cm}$