Sunlight shines directly on to the wall of a large soap, Ask an Expert

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Sunlight shines directly on to the wall of a large soap bubble (n = 1.33) which is floating in air (n=1). The portion of the this light that is visible to our eye has wave lengths from roughly %u03BB=400nm to %u03BB=700nm.

1) Assuming the light hits perpendicular to the wall of the soap bubble, what is the minimum thickness it could have to produce completely constructive interference for blue light (%u03BB = 475 nm)?

tconstr = nm

2) What is the minimum thickness it could have to produce completely destructive interference for this same blue light?

tdestr= nm

3) What is the minimum thickness it could have to produce completely destructive interference for blue light (%u03BB = 475 nm)?

tdestr= nm

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