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focal lenght of a lens

djam
in Homework Help

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I am doing an experiment to calculate focal lenght of a lens.

 

From a graph of 1/d0 against /di

 

How will I find the focal lenght

The points which i have do not touch the x or y axis so I am not sure if I need to extend my line.

 

Also If i know the uncertainty in the distance to the object(do) and distance to the image (di)

 

how can i find the uncertainty in 1/d object and 1/d image

 

Thankyou

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