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Answer:
200 nm
Explanation:
We need a constructive interference to see the bright reflection
we know that 
where m=1 and 
is the wavelength of the gasoline
so 
putting the value of m and in thickness equation
so the thickness of the film will be 200 nm
<span>Make eye contact look at everyone ur speaking to not just one person speak loud and clearly make sure your understandable</span>
I would say A. Allowing us to improve efficiency in the workplace has helped grow our economy and we can thank technology for that. Due the it always improving our lives only get that much easier.
