A thin layer of oil (n=1.47) floats on water (n=1.33) in the parking lot of a st

Question

A thin layer of oil (n=1.47) floats on water (n=1.33) in the parking lot of a store. When viewed in direct sunlight, it has a multicolored appearance.

a) Why does it appear Multicolored?

b)The two rings of magenta color in the reflected light, which indicates the green wavelengths in the sunlight (lamda = 530nm) cancelled are the two reflected rays (2&5). What are the 2 minimum thicknesses of the oil that would do this?

c) What visible colors, if any, would be strongly reflected at these thicknesses?

Explanation / Answer

a)due to different density of oil and water diffraction takes place causing multicolour b).2 micro meter c) voilet , indigo

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