PASCO OS-8515C Basic Optics System - Manual (Page 40)

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B a s i c O p t i c s S y s t e m Experiment 13: Focal Length and Magnification of a Concave Mirror
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3. Calculate the percent differences between the absolute values of M found using
the two methods. Record the results in Table 13.3.
Questions
1. Is the image formed by the mirror upright or inverted?
2. Is the image real or virtual? How do you know?
3. By looking at the image, how can you tell that the magnification is negative?
4. 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?
Table 13.3: Magnification
calculated from image and object distances
calculated from image and object sizes
% difference
M
M