How to calculate thickness of the film for a soap solution with a resulting reflection wavelength of 475nm and a refractive index of 1.4?

15 February 2018 1 1K Report

it was found that a soap solution fil with an unknown constant thickness reflects the daylight and the resulting reflection is blue with a wavelength of 475 nm. T he refractive index of the soap is 1.4. What is the thickness of the film?

Gerhard Martens

Please try to verify the equation(s) in the link.

Please solve the equation for 'maximum reflection' for d.

For alpha and beta not being zero please use Snell's law.

http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/soapfilm.html

Good luck

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