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Solved: The derivation of the expression for angular
Chapter 34, Problem 107P(choose chapter or problem)
The derivation of the expression for angular magnification, Eq. (34.22), assumed a near point of 25 cm. In fact, the near point changes with age as shown in Table 34.1. In order to achieve an angular magnification of \(2.0 \times\), what focal length should be used by a person of
(a) age 10;
(b) age 30;
(c) age 60?
(d) If the lens that gives M = 2.0 for a 10-year-old is used by a 60-year-old, what angular magnification will the older viewer obtain?
(e) Does your answer in part (d) mean that older viewers are able to see more highly magnified images than younger viewers? Explain.
Questions & Answers
QUESTION:
The derivation of the expression for angular magnification, Eq. (34.22), assumed a near point of 25 cm. In fact, the near point changes with age as shown in Table 34.1. In order to achieve an angular magnification of \(2.0 \times\), what focal length should be used by a person of
(a) age 10;
(b) age 30;
(c) age 60?
(d) If the lens that gives M = 2.0 for a 10-year-old is used by a 60-year-old, what angular magnification will the older viewer obtain?
(e) Does your answer in part (d) mean that older viewers are able to see more highly magnified images than younger viewers? Explain.
ANSWER:Solution 107P
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