A Puddle of Water Has a Thin Film of Gasoline

question 32

Multiple Choice

A puddle of water has a thin film of gasoline floating on it.A beam of light is shining perpendicular on the film.If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and water are 1.40 and 1.33,respectively,what is the minimum thickness of the film to see a bright reflection?

• A) 100 nm
• B) 200 nm
• C) 300 nm
• D) 400 nm
• E) 500 nm

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Definitions:

Insular Cases

Series of cases between 1901 and 1904 in which the Supreme Court ruled that constitutional protection of individual rights did not fully apply to residents of “insular” territories acquired by the United States in the Spanish-American War, such as Puerto Rico and the Philippines.

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