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**1. The problem statement, all variables and given/known data**

A researcher measures the thickness of a layer of benzene (n = 1.50) floating on water by shining monochromatic light onto the film and varying the wavelength of the light. She finds that light of wavelength 565nm is reflected most strongly from the film. What does she calculate for the minimum thickness of the film?

Values:

λ = 565*10^-9m

n(benzene) = 1.50

n(water) = 1.33

**2. Relevant equations**

I have tried both of these equations:

2t = mλ

2t = ½mλ

**3. The attempt at a solution**

Subbing in the values needed, I get

t = (1 * 565*10^-9) / 2

= 2.825*10^-7m

or

t = (½ * 1 * 565*10^-9) / 2

= 1.4125*10^-7m