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## Homework Statement

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

## Homework Equations

I have tried both of these equations:

2t = mλ

2t = ½mλ

## 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