
Concept explainers
How far from a converging lens with a focal length of 32 cm should an object be placed to produce a real image which is of the same size of the object.

Answer to Problem 56P
Solution:
The object distance from the lens should be 64 cm.
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 a positive lens real image formation requires v and u to be of opposite sign.
Thus,
Using lens equation,
This gives,
Chapter 23 Solutions
Physics: Principles with Applications
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