When white light shines on a thin film of soap, light is reflected from he back
ID: 1391919 • Letter: W
Question
When white light shines on a thin film of soap, light is reflected from he back surface of the film only. the front surface of the film only. both the front and back surfaces of the film. This results in a Doppler shift in the frequency of the reflected light. refraction of the reflected light rays. interference between the reflected light rays. Colors are seen in the soap film because certain wavelengths of the reflected light are absorbed by pigments in the soap. are refracted at different angles. are canceled due to destructive interference. Photo taken from http://soapbubble.dk/english/. Used with permission.Explanation / Answer
Interference on the surface of a soap bubble: An incoming light ray is partly reflected by the top surface of the soap film and partly reflected by the bottom surface. The wave reflected from the bottom surface has traveled further (an extra distance equal to twice the thickness of the film) so emerges out of step with the top wave. When the two waves meet, they add together, and some colors are removed by destructive interference. Where the film is thickest, the bubble appears more blueish; where it's thinner, it will look more violet or magenta.
a)
both front and back surface of the flim
b)
Light is refracted upon entering the soap film, but the reflected light undergoes no net refraction.
interference between the reflected light ray
c)
are canceled due to destructive interference
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