# Thin-Film Interference

## Homework Statement

A soap film with different thicknesses at different placers has an unknown refractive index n and air on both sides. In reflected light it looks multicolored. One region looks yellow because destructive interference has removed blue (($$\lambda_{vacuum}$$=469nm)) from the reflected light, while anotyher loks magenta because destructive interference has removed green (($$\lambda_{vacuum}$$=555nm)). In these regions the film has the minimum thickness t required for the destructive interference to occur. Find the ration t$$_{magenta}$$/t$$_{yellow}$$

## Homework Equations

$$\lambda_{film}$$ = $$\lambda_{vacuum}$$/ n

## The Attempt at a Solution

i know from the problem that m =1 because it says minimum thickness. But after that I do not know how I should set up the problem using algebra or physics.

## Answers and Replies

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