A360 nm thick oil film floats on the surface of the water. the indices of refraction of the oil and the water are 1.50 and 1.33, respectively. the surface of the oil is illuminated from above at normal incidence with white light. in the situation above, the two wavelengths of light in the 400 nm to 800 nm wavelength band that are most strongly reflected, in nm, are closest to:

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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