The colors on an oil slick are caused by reflection and (explain why)
a. Diffraction
b. Interference
c. Refraction
d. Polarization
e. Ionization
The answer is b) Interference
Reason -
Light Reflects from the top of the oil surface and from the bottom
surface.The path length of light is different depending upon
whether the light comes from top of the surface or form the bottom.
(Here Path length is distance from reflection point to your eye.)
Now, If the difference in path length is an integral multiple of of
the wavelength of light then rays reflected from two points will
strengthen each other, a process called Constructive interfernce ,
colours are visible , while if the reflected rays reach eye out of
step then destructive interference occurs in which colours will not
be observed. Thus due to different thickness of oil film at
different points, causes different colours to be seen.
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