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
Is it a multiple choice answer? if so would like to see the answers as there are TONS of effective ways and if i list one it may not be in that list you have if its multiple choice.
Answer:
Application
Explanation:
Application software comes in many forms like apps, and even on computers. The software is most common on computers of all kinds while mobile applications are most common on cellular devices.