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Nady [450]
3 years ago
15

A piece of glass has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. If the wavele

ngth of light incident on the film is 560 nm and the indices of refraction of gasoline and glass are 1.40 and 1.50, respectively, what is the minimum nonzero thickness of the film to see a bright reflection?
Computers and Technology
1 answer:
kobusy [5.1K]3 years ago
3 0

Answer:

200 nm

Explanation:

We need a constructive interference to see the bright reflection

we know that 2t=m\lambda  where m=1 and \lambda is the wavelength of the gasoline

so \lambda =\frac{560}{1.4}=400nm

putting the value of m and \lambda in thickness equation

t=\frac{1\times 400}{2}=200nm

so the thickness of the film will be 200 nm

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