- #1
dh743
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Homework Statement
Following data recorded:
Di (distance image to lens) 6.0 8.0 10.0 12.0 14.0
Magnification 0.2 0.6 1.0 1.4 1.8
Graph magnification against di and use the graph to find the focal length of the lens.
Homework Equations
[tex]\frac{1}{di}[/tex]+[tex]\frac{1}{d(object)]}[/tex]=[tex]\frac{1}{f}[/tex]
M=[tex]\frac{di}{do}[/tex]
The Attempt at a Solution
I worked out that the gradient should be equal to [tex]\frac{M}{di}[/tex]
=[tex]\frac{1}{do}[/tex]
Since the gradient is obviously 0.2, this leaves me with a constant value for do of 5cm, which is in fact the correct answer for the focal length. It doesn't make sense that there would be constant do value, nor does it make sense that this value would be the same as the focal length since no image is formed when object on focal length. Any instruction on manipulating these formulae is much appreciated.