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What is the value of the focal length fn2
of a convergent lens with index of refraction ( n2 =1.5) if it was
fn1 =5cm for an index of refraction n1 = 1.4 .

  • Physics -

    f is inversely proportional to 1/(N-1).

    fn2/fn1 = .4/.5 = 0.8

    fn2 = 4 cm

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