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    The radius of curvature R of the lens can be calculated using any point on thegraph together with the formula
    R =Gd/2λ
    where λ = 589.3 nm.Determine R.

    It wants R in m
    G has been worked out in the previous question as 0.11
    d is 14.25mm

    This should be a simple matter of plugging numbers in but I can't get the right answer. I get the right digits but its always x10 to the something which it shouldn't be. I can't work out where its going wrong.
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    you have to convert all the units in to metres (even G)
 
 
 
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