(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

What is the minimum (non-zero) thickness of a benzene (n = 1.501) thin film that will result in constructive interference when viewed at normal incidence and illuminated with orange light (lamba = 615 nm)? A glass slide (ng = 1.620) supports the thin film

answer= 204 nm

2. Relevant equations

I rearranged an equation to get

t= (m=.5)(lambda) / 2*n

but i'm thrown off by how they give me two n values?

3. The attempt at a solution

I tried using my equation plugging in each n, but did not get the answer.

please help, thanks in advance :)

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# Minimum thickness of thin film constructive interference

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