®
B a s i c O p t i c s S y s t e m
E x p e r i m e n t 1 2 : F o c a l L e n g t h a n d M a g n i f i c a ti o n o f a T h i n L e n s
34
2.
Calculate the absolute value of
M
(for each of the two lens positions) using your
measurements of the image size and object size. Record the results in Table 12.3.
(eq. 12.3)
3.
Calculate the percent differences between the absolute values of
M
found using
the two methods. Record the results in Table 12.3.
Questions
1.
Is the image formed by the lens upright or inverted?
2.
Is the image real or virtual? How do you know?
3.
Explain why, for a given screen-to-object distance, there are two lens positions
where a clear image forms.
4.
By looking at the image, how can you tell that the magnification is negative?
5.
You made three separate determinations of
f
(by measuring it directly with a dis-
tant object, from the x-intercept of your graph, and from the y-intercept). Where
these three values equal? If they were not, what might account for the variation?
M
image size
object size
-------------------------
=
Table 12.3: Magnification
Point 1
Point 2
calculated from image and object distances
calculated from image and object sizes
% difference
M
M
Summary of Contents for OS-8515B
Page 6: ... Basic Optics System About the Experiments 6 ...
Page 26: ... Basic Optics System Experiment 9 Apparent Depth 26 ...
Page 38: ... Basic Optics System Experiment 13 Telescope 38 ...
Page 42: ... Basic Optics System Experiment 14 Microscope 42 ...
Page 44: ... Basic Optics System Experiment 15 Shadows 44 ...
Page 46: ... Basic Optics System Telescope and Microscope Test Pattern 46 ...