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You have a tglass with an n=1.5 to the left of a tplastic with an n...

You have a tglass with an n=1.5 to the left of a tplastic with an n of 1.4, on the outside of either you have n=1. For a wavelength of 800 nm,

1. What is the 2nd thinnest tglass such that we see constructive interference?

2. What is the thinnest possible tplastic such that we get constructive interference.

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