Concept explainers
(a) To determine:
How far from a 50 mm focal length lens must be placed if its image is to be magnified 2.5 times and be real
Answer to Problem 54P
Solution:
The object should be placed 70 mm before the lens
Explanation of Solution
Formula used:
Lens equation,
f, u and v are lens to focal, lens to object and lens to image distances repectively, negative when opposite to optical path and positive when in the direction of optical path.
Magnification,
Calculation:
For the image to be real v and u should have opposite sign. Thus,
Putting this in the lens equation we get,
This gives, u= -70 mm.
(b) To determine:
What if the image is to virtual and magnified
Answer to Problem 54P
Solution:
The object should be placed 30 mm before the lens
Explanation of Solution
Calculation:
For image to be virtual v and u should be of the same sign.
Putting this in the lens equation,
This gives,
Chapter 23 Solutions
Physics: Principles with Applications
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