p36 054

background image

54. According to Eq. 36-41, the number of fringes shifted (∆N ) due to the insertion of the film of thickness

L is ∆N = (2L/λ)(n

1). Therefore,

L =

λN

2(n

1)

=

(589 nm)(7.0)

2(1.40

1)

= 5.2 µm .


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