Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 25 - Optical Instruments - Problems - Page 740: 12

Answer

2.3 diopters

Work Step by Step

The person’s current near point is 52 cm. With the reading glasses, an object placed 25 cm from the face (23 cm from the lens) should produce a virtual image that is 52 cm from the eye (50 cm from the lens). In other words, $d_o=0.23 m$ and $ d_i=-0.50 m $. Find the power of the lens from the lens equation. $$P=\frac{1}{f}=\frac{1}{d_o}+\frac{1}{d_i}$$ $$P=\frac{1}{0.23m}+\frac{1}{-0.50m}=2.3D$$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.