Observe changes in a real image when varying distance and amount of lens being covered.
Part 1: Focal Length
To determine focal length, we went outside and used the sun as a source of parallel rays and then
varied the distance until we found a distance that created the smallest spot.
f = 18.3 ± .5 cm
As you can see in the graph, we get obtain a slope of .928 and an x intercept of 5.067. The slope
should be one, however we have an error of 7.2%. The inverse of the intercept should also be
our focal length which is 19.7 cm. This is not within the bounds of uncertainty and is an error of
7.8%.
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