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Homework Statement
[PLAIN]http://img135.imageshack.us/img135/6027/physicsch3569.png
Homework Equations
2L = (m + 0.5) (λ/n) for m = 0, 1, 2, ... (maxima - bright film in air)
2L = m(λ/n) for m = 0, 1, 2, ... (minima - dark film in air)
The Attempt at a Solution
Bright
2L = (10 + 0.5)(630E-9/1.5)
L = 2.205E-6 m
Dark
2L = 9(630E-9/1.5)
L = 1.89E-6 m
Is this the right approach? I was thinking the change in film thickness would be the difference between the two L values. But the book gives the answer as 1.89 E-6 m. Which is what I got for the Dark set of fringes. So was I supposed to negate the bright ones or did I use the wrong approach here?
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