
Concept explainers
(a)
The position of the image from the lens.
(a)

Answer to Problem 78A
The position of the image from the lens is
Explanation of Solution
Given:
The position of the onion cell is
The focal length is
Formula used:
The expression for the mirror equation is,
Here,
Calculation:
The position of the image is,
Conclusion:
Thus, the position of the image from the lens is
(b)
The magnification of the image.
(b)

Answer to Problem 78A
The magnification of the image is
Explanation of Solution
Given:
The position of the onion cell is
The focal length is
Formula used:
The expression for the magnification equation is
Here,
Calculation:
From part (a), the position of the image from the lens is
The magnification is,
Conclusion:
Thus, the magnification of the image is
(c)
The position of the final image.
(c)

Answer to Problem 78A
The position of the final image is
Explanation of Solution
Given:
The position of the eyepiece is
The focal length of the eyepiece is
Formula used:
The expression for the mirror equation is,
Here,
Calculation:
The position of the image is,
Conclusion:
Thus, the position of the final image is
(d)
The magnification of the compound system.
(d)

Answer to Problem 78A
The magnification of the compound system is
Explanation of Solution
Given:
The position of the eyepiece is
The focal length of the eyepiece is
Formula used:
The expression for the magnification equation is
Here,
Calculation:
From part (b), the magnification of the image is
From part (c), the position of the final image is
The magnification of the eyepiece is,
The magnification of the compound system is,
Conclusion:
Thus, the magnification of the compound system is
Chapter 18 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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