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15 cards from this deck
1f=1u+1v\frac{1}{f} = \frac{1}{u} + \frac{1}{v}f1=u1+v1
Focal length of the lens
Object distance (object to lens)
Image distance (lens to image)
Object distance uuu must be greater than focal length fff
Focus lens on distant object, measure image to lens distance
At least 5 (some magnified, some diminished images)
Calculate fff for each trial, find average, compare to known fff
Plot 1u\frac{1}{u}u1 vs 1v\frac{1}{v}v1, check for straight line
Both intercepts equal 1f\frac{1}{f}f1
Straight line with negative slope
Affects accuracy of measuring vvv (image distance)
Introduces error in both uuu and vvv measurements
Reading metre stick from inconsistent angles (systematic if always same wrong angle, random if varying)
Object distance uuu is less than focal length fff
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