# Physica

posted by
**fa 2**
.

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 .

posted by
**fa 2**
.

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 .