PHYS 2212 Module 14.7

The Simple Magnifier

Recommended Reading

14.7 The Simple Magnifier

Learning Objectives

By the end of this section, you will be able to:

  • Understand the optics of a simple magnifier
  • Characterize the image created by a simple magnifier

The Simple Magnifier


A 1.80 cm tall snail sits 9.00 cm in front of a thin lens with focal length 11.5 cm. Find the image distance, the image height, and the lateral magnification of the image.

Nolan uses a thin lens with focal length 11.5 cm as a magnifying glass to examine a snail, which is 1.80 cm tall. He adjusts the position of the lens so that he sees a focused image at (negative) infinity. The image has an angular magnification of 2.45. What is the approximate near point distance of his eye?