Film interference with light and refration

[stickplot]

ok so i know why this happens but I am just not sure how to see how thick the film would be, I am not sure if your supposed to use the equation dsin(-)=wavelength someone help please thanks!

You are outside in the Sun blowing bubbles. As you raise the round wand to blow bubbles, you notice an array of colors on the soap film.

* Blue = 430 nanometers
* Green = 500 nanometers
* Red = 650 nanometers
* The bubble film has an index of refraction of n = 1.3.



a. How thick is the film where you see yellow?

b. How thick is the film where you see cyan?

 

[Carid]

Do you think this question is talking about yellow and cyan as pure colours, or as mixtures of other colours that the human eye perceives as yellow and as cyan ?

Under what conditions would an area of bubble appear as a) as single pure colour b) a mixture of colours which we perceive as a single colour?