Homework Help: Physica

Posted by LO on Wednesday, August 1, 2012 at 11:58pm.

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 - drwls, Thursday, August 2, 2012 at 12:18am
f is inversely proportional to 1/(N-1).

fn2/fn1 = .4/.5 = 0.8

fn2 = 4 cm

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