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## Homework Statement

Two waves of light in air, of wavelength 550 nm, are initially in phase. They then both travel through a layer of plastic as shown in the figure, with

*L*1 = 4.00 μm,

*n*1 = 1.40,

*L*2 = 3.50 μm , and

*n*2 = 1.60. What is their phase difference after they both have emerged from the layers, when they arrive at the same point?

## Homework Equations

N is the numbers of lemdas

N1=L1*n1/λ

N2=L2*n2/λ

N in air = (L1-L2)/λ n(air)=1

## The Attempt at a Solution

N2+Nair-N2=0.909 but the correct answer is 5.71?