Concept explainers
(a) To determine:
If a thin converging lens is moved closer to a nearby object, the position of the real image formed, is changed.
Answer to Problem 25Q
Solution:
Yes, it is changed. As the thin converging lens is moved closer to a nearby object, the position of the real image formed, is changed.
Explanation of Solution
The given statement can be discussed using the thin lens equation.
The Thin lens equation is given by
Where,
di is the image distance
do is the object distance
f is the focal length.
As given in the statement, if the object distance is reduced by moving the lens closer to the object, will be large.
In order to comply with the above equation, decreases, this means di increases, the image distance increases. The image position is moved farther from the lens.
(b) To determine:
If a thin converging lens is moved closer to a nearby object, the size of the real image formed, is changed.
Answer to Problem 25Q
Solution:
Yes, it is changed. As the thin converging lens is moved closer to a nearby object, the size of the real image formed, is changed.
Explanation of Solution
The size of the image formed if the object position changes can be explained by the magnification equation.
Where,
m is the magnification
di is the image distance
do is the object distance
As the lens is moved towards the object, the object distance is lowered and as discussed above the image distance increases.
If di is increased and do is lowered and from the above equation, the magnification becomes larger.
If the magnification is larger, the size of the image gets larger.
Chapter 23 Solutions
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