different positions. Explain this phenomenon in terms of light interference.
Seashells, butterfly wings, and the feathers of some birds often change color as you look at them from?
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different positions. Explain this phenomenon in terms of light interference.
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It's refraction.
The feathers or wings are not completely opaque. When the light hits it at an angle, it penetrates the object to a certain depth before being reflected out again. The wavelenght (i.e., color) depends on the distance the light has traveled inside the object and this is dependant on the angle of incidence.
When the light hits at a 90 degree angle, the distance traveled will be the shortest. The more accute the angle, the greater the distance traveled inside the object. The greater the distance, the more the wavelength of the light is affected.