Author Question: A piece of glass has a thin film of gasoline floating on it. A beam of light is shining ... (Read 61 times)

mrsjacobs44 · **on:** Jul 29, 2018

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

Question 2

If the sunlight from a star peaks at a wavelength of 0.55 m, what temperature does this imply for the surface of that star? The constant in Wien's law is 0.00290 m K.

A) 9500 K
B) 5300 K
C) 2500 K
D) 25,000 K
E) 15,000 K

mcomstock09 · **Reply #1 on:** Jul 29, 2018

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